Question

这是我在许多其他类继承的类中作为方法提出的。这个想法是它允许在相同类型的对象的属性之间进行简单比较。

现在，这确实有效 - 但为了提高我的代码质量，我想我会把它扔出去仔细检查。如何更好/更有效/等等？

/// <summary>
/// Compare property values (as strings)
/// </summary>
/// <param name="obj"></param>
/// <returns></returns>
public bool PropertiesEqual(object comparisonObject)
{

    Type sourceType = this.GetType();
    Type destinationType = comparisonObject.GetType();

    if (sourceType == destinationType)
    {
        PropertyInfo[] sourceProperties = sourceType.GetProperties();
        foreach (PropertyInfo pi in sourceProperties)
        {
            if ((sourceType.GetProperty(pi.Name).GetValue(this, null) == null && destinationType.GetProperty(pi.Name).GetValue(comparisonObject, null) == null))
            {
                // if both are null, don't try to compare  (throws exception)
            }
            else if (!(sourceType.GetProperty(pi.Name).GetValue(this, null).ToString() == destinationType.GetProperty(pi.Name).GetValue(comparisonObject, null).ToString()))
            {
                // only need one property to be different to fail Equals.
                return false;
            }
        }
    }
    else
    {
        throw new ArgumentException("Comparison object must be of the same type.","comparisonObject");
    }

    return true;
}

Answer 1

我正在寻找一些代码片段，这些代码可以帮助编写单元测试。这是我最终使用的。

public static bool PublicInstancePropertiesEqual<T>(T self, T to, params string[] ignore) where T : class 
  {
     if (self != null && to != null)
     {
        Type type = typeof(T);
        List<string> ignoreList = new List<string>(ignore);
        foreach (System.Reflection.PropertyInfo pi in type.GetProperties(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance))
        {
           if (!ignoreList.Contains(pi.Name))
           {
              object selfValue = type.GetProperty(pi.Name).GetValue(self, null);
              object toValue = type.GetProperty(pi.Name).GetValue(to, null);

              if (selfValue != toValue && (selfValue == null || !selfValue.Equals(toValue)))
              {
                 return false;
              }
           }
        }
        return true;
     }
     return self == to;
  }

编辑：

与上面相同的代码，但使用LINQ和扩展方法：

public static bool PublicInstancePropertiesEqual<T>(this T self, T to, params string[] ignore) where T : class
{
    if (self != null && to != null)
    {
        var type = typeof(T);
        var ignoreList = new List<string>(ignore);
        var unequalProperties =
            from pi in type.GetProperties(BindingFlags.Public | BindingFlags.Instance)
            where !ignoreList.Contains(pi.Name) && pi.GetUnderlyingType().IsSimpleType() && pi.GetIndexParameters().Length == 0
            let selfValue = type.GetProperty(pi.Name).GetValue(self, null)
            let toValue = type.GetProperty(pi.Name).GetValue(to, null)
            where selfValue != toValue && (selfValue == null || !selfValue.Equals(toValue))
            select selfValue;
        return !unequalProperties.Any();
    }
    return self == to;
}

public static class TypeExtensions
   {
      /// <summary>
      /// Determine whether a type is simple (String, Decimal, DateTime, etc) 
      /// or complex (i.e. custom class with public properties and methods).
      /// </summary>
      /// <see cref="http://stackoverflow.com/questions/2442534/how-to-test-if-type-is-primitive"/>
      public static bool IsSimpleType(
         this Type type)
      {
         return
            type.IsValueType ||
            type.IsPrimitive ||
            new[]
            {
               typeof(String),
               typeof(Decimal),
               typeof(DateTime),
               typeof(DateTimeOffset),
               typeof(TimeSpan),
               typeof(Guid)
            }.Contains(type) ||
            (Convert.GetTypeCode(type) != TypeCode.Object);
      }

      public static Type GetUnderlyingType(this MemberInfo member)
      {
         switch (member.MemberType)
         {
            case MemberTypes.Event:
               return ((EventInfo)member).EventHandlerType;
            case MemberTypes.Field:
               return ((FieldInfo)member).FieldType;
            case MemberTypes.Method:
               return ((MethodInfo)member).ReturnType;
            case MemberTypes.Property:
               return ((PropertyInfo)member).PropertyType;
            default:
               throw new ArgumentException
               (
                  "Input MemberInfo must be if type EventInfo, FieldInfo, MethodInfo, or PropertyInfo"
               );
         }
      }
   }

Answer 2

更新：最新版本的Compare-Net-Objects位于GitHub，NuGet package和Tutorial。它可以被称为

//This is the comparison class
CompareLogic compareLogic = new CompareLogic();

ComparisonResult result = compareLogic.Compare(person1, person2);

//These will be different, write out the differences
if (!result.AreEqual)
    Console.WriteLine(result.DifferencesString);

或者，如果您需要更改某些配置，请使用

CompareLogic basicComparison = new CompareLogic() 
{ Config = new ComparisonConfig()
   { MaxDifferences = propertyCount 
     //add other configurations
   }
};

可配置参数的完整列表位于ComparisonConfig.cs

原始回答：

我在您的代码中看到的限制：

最大的一点就是它没有进行深层对象比较。
在属性为列表或包含列表作为元素的情况下，它不会逐个元素进行元素比较（这可以是n级）。
它没有考虑到不应该比较某些类型的属性（例如用于过滤目的的Func属性，如PagedCollectionView类中的属性）。
它不会跟踪实际不同的属性（因此您可以在断言中显示）。

我今天正在寻找一些单元测试解决方案来通过属性深度比较进行属性，最后我使用了：http://comparenetobjects.codeplex.com。

这是一个只有一个类的免费库，您可以像这样使用它：

var compareObjects = new CompareObjects()
{
    CompareChildren = true, //this turns deep compare one, otherwise it's shallow
    CompareFields = false,
    CompareReadOnly = true,
    ComparePrivateFields = false,
    ComparePrivateProperties = false,
    CompareProperties = true,
    MaxDifferences = 1,
    ElementsToIgnore = new List<string>() { "Filter" }
};

Assert.IsTrue(
    compareObjects.Compare(objectA, objectB), 
    compareObjects.DifferencesString
);

此外，它可以轻松地为Silverlight重新编译。只需将一个类复制到Silverlight项目中，然后删除一行或两行代码，以便进行Silverlight中不可用的比较，例如私有成员比较。

Answer 3

我认为最好遵循Override Object＃Equals（）的模式 为了更好的描述：阅读Bill Wagner的Effective C# - 第9项我认为

public override Equals(object obOther)
{
  if (null == obOther)
    return false;
  if (object.ReferenceEquals(this, obOther)
    return true;
  if (this.GetType() != obOther.GetType())
    return false;
  # private method to compare members.
  return CompareMembers(this, obOther as ThisClass);
}

同样在检查相等性的方法中，您应该返回true或false。要么它们是相同的，要么它们不是......而不是抛出异常，返回false。
我考虑重写Object＃Equals。
即使您已经考虑过这一点，但使用Reflection来比较属性应该很慢（我没有数字来支持这一点）。这是C＃中valueType＃Equals的默认行为，建议您对值类型重写Equals并对性能进行成员比较。（之前我速读这个，因为你有一组自定义属性对象......我的不好。）

2011年12月更新：

当然，如果类型已经有生产Equals（），那么你需要另一种方法。
如果您使用它来仅仅为了测试目的而比较不可变数据结构，则不应该向生产类添加等于（有人可能会通过查找Equals实现来加密测试，或者您可能会阻止创建生产所需的等于实施）。

Answer 4

如果性能无关紧要，您可以将它们序列化并比较结果：

var serializer = new XmlSerializer(typeof(TheObjectType));
StringWriter serialized1 = new StringWriter(), serialized2 = new StringWriter();
serializer.Serialize(serialized1, obj1);
serializer.Serialize(serialized2, obj2);
bool areEqual = serialized1.ToString() == serialized2.ToString();

Answer 5

我认为 Big T 的答案相当不错，但缺乏深度比较，所以我稍微调整了一下：

using System.Collections.Generic;
using System.Reflection;

/// <summary>Comparison class.</summary>
public static class Compare
{
    /// <summary>Compare the public instance properties. Uses deep comparison.</summary>
    /// <param name="self">The reference object.</param>
    /// <param name="to">The object to compare.</param>
    /// <param name="ignore">Ignore property with name.</param>
    /// <typeparam name="T">Type of objects.</typeparam>
    /// <returns><see cref="bool">True</see> if both objects are equal, else <see cref="bool">false</see>.</returns>
    public static bool PublicInstancePropertiesEqual<T>(T self, T to, params string[] ignore) where T : class
    {
        if (self != null && to != null)
        {
            var type = self.GetType();
            var ignoreList = new List<string>(ignore);
            foreach (var pi in type.GetProperties(BindingFlags.Public | BindingFlags.Instance))
            {
                if (ignoreList.Contains(pi.Name))
                {
                    continue;
                }

                var selfValue = type.GetProperty(pi.Name).GetValue(self, null);
                var toValue = type.GetProperty(pi.Name).GetValue(to, null);

                if (pi.PropertyType.IsClass && !pi.PropertyType.Module.ScopeName.Equals("CommonLanguageRuntimeLibrary"))
                {
                    // Check of "CommonLanguageRuntimeLibrary" is needed because string is also a class
                    if (PublicInstancePropertiesEqual(selfValue, toValue, ignore))
                    {
                        continue;
                    }

                    return false;
                }

                if (selfValue != toValue && (selfValue == null || !selfValue.Equals(toValue)))
                {
                    return false;
                }
            }

            return true;
        }

        return self == to;
    }
}

Answer 6

我会将以下行添加到PublicInstancePropertiesEqual方法中以避免copy＆amp;粘贴错误：

Assert.AreNotSame(self, to);

Answer 7

您是否在属性中的所有对象上覆盖.ToString（）？否则，第二次比较可能会返回null。

另外，在第二次比较中，就可读性而言，从（A == B）与（A = = B）相比，我在六个月/两年后的可读性方面。这条线本身非常宽，如果你有一台宽大的显示器就可以了，但可能打印得不好。（挑剔）

您的所有对象是否始终使用此代码可以使用的属性？是否存在一些内部的，非属性的数据，这些数据可能因对象而异，但所有暴露的数据都是相同的？我正在考虑一些可能随时间变化的数据，比如两个随机数发生器恰好在一个点上达到相同的数字，但是会产生两个不同的信息序列，或者只是任何不暴露的数据通过属性界面。

Answer 8

我最终这样做了：

    public static string ToStringNullSafe(this object obj)
    {
        return obj != null ? obj.ToString() : String.Empty;
    }
    public static bool Compare<T>(T a, T b)
    {
        int count = a.GetType().GetProperties().Count();
        string aa, bb;
        for (int i = 0; i < count; i++)
        {
            aa = a.GetType().GetProperties()[i].GetValue(a, null).ToStringNullSafe();
            bb = b.GetType().GetProperties()[i].GetValue(b, null).ToStringNullSafe();
            if (aa != bb)
            {
                return false;
            }
        }
        return true;
    }

用法：

    if (Compare<ObjectType>(a, b))

<强>更新

如果您想按名称忽略某些属性：

    public static string ToStringNullSafe(this object obj)
    {
        return obj != null ? obj.ToString() : String.Empty;
    }
    public static bool Compare<T>(T a, T b, params string[] ignore)
    {
        int count = a.GetType().GetProperties().Count();
        string aa, bb;
        for (int i = 0; i < count; i++)
        {
            aa = a.GetType().GetProperties()[i].GetValue(a, null).ToStringNullSafe();
            bb = b.GetType().GetProperties()[i].GetValue(b, null).ToStringNullSafe();
            if (aa != bb && ignore.Where(x => x == a.GetType().GetProperties()[i].Name).Count() == 0)
            {
                return false;
            }
        }
        return true;
    }

用法：

    if (MyFunction.Compare<ObjType>(a, b, "Id","AnotherProp"))

Answer 9

为了完整性，我想添加引用 http://www.cyotek.com/blog/comparing-the-properties-of-two-objects-via-reflection 它具有比本页大多数其他答案更完整的逻辑。

但是我更喜欢Compare-Net-Objects库 https://github.com/GregFinzer/Compare-Net-Objects（由Liviu Trifoi的answer引用）
该库具有NuGet包http://www.nuget.org/packages/CompareNETObjects和多个要配置的选项。

Answer 10

您可以通过每种类型只调用一次GetProperties来优化代码：

public static string ToStringNullSafe(this object obj)
{
    return obj != null ? obj.ToString() : String.Empty;
}
public static bool Compare<T>(T a, T b, params string[] ignore)
{
    var aProps = a.GetType().GetProperties();
    var bProps = b.GetType().GetProperties();
    int count = aProps.Count();
    string aa, bb;
    for (int i = 0; i < count; i++)
    {
        aa = aProps[i].GetValue(a, null).ToStringNullSafe();
        bb = bProps[i].GetValue(b, null).ToStringNullSafe();
        if (aa != bb && ignore.Where(x => x == aProps[i].Name).Count() == 0)
        {
            return false;
        }
    }
    return true;
}

Answer 11

确保对象不是null。

拥有obj1和obj2：

if(obj1 == null )
{
   return false;
}
return obj1.Equals( obj2 );

Answer 12

这里修改了一个将null = null视为等于

 private bool PublicInstancePropertiesEqual<T>(T self, T to, params string[] ignore) where T : class
        {
            if (self != null && to != null)
            {
                Type type = typeof(T);
                List<string> ignoreList = new List<string>(ignore);
                foreach (PropertyInfo pi in type.GetProperties(BindingFlags.Public | BindingFlags.Instance))
                {
                    if (!ignoreList.Contains(pi.Name))
                    {
                        object selfValue = type.GetProperty(pi.Name).GetValue(self, null);
                        object toValue = type.GetProperty(pi.Name).GetValue(to, null);
                        if (selfValue != null)
                        {
                            if (!selfValue.Equals(toValue))
                                return false;
                        }
                        else if (toValue != null)
                            return false;
                    }
                }
                return true;
            }
            return self == to;
        }

Answer 13

我建议的第一件事就是将实际比较分开，以便它更具可读性（我还取出了ToString（） - 是否需要？）：

else {
    object originalProperty = sourceType.GetProperty(pi.Name).GetValue(this, null);
    object comparisonProperty = destinationType.GetProperty(pi.Name).GetValue(comparisonObject, null);

    if (originalProperty != comparisonProperty)
        return false;

下一个建议是尽可能减少反射的使用 - 它真的很慢。我的意思是，真的慢。如果你打算这样做，我会建议缓存属性引用。我对Reflection API并不熟悉，所以如果有点关闭，只需调整以使其编译：

// elsewhere
Dictionary<object, Property[]> lookupDictionary = new Dictionary<object, Property[]>;

Property[] objectProperties = null;
if (lookupDictionary.ContainsKey(sourceType)) {
  objectProperties = lookupProperties[sourceType];
} else {
  // build array of Property references
  PropertyInfo[] sourcePropertyInfos = sourceType.GetProperties();
  Property[] sourceProperties = new Property[sourcePropertyInfos.length];
  for (int i=0; i < sourcePropertyInfos.length; i++) {
    sourceProperties[i] = sourceType.GetProperty(pi.Name);
  }
  // add to cache
  objectProperties = sourceProperties;
  lookupDictionary[object] = sourceProperties;
}

// loop through and compare against the instances

但是，我不得不说我同意其他海报。这闻起来很懒惰而且效率低下。您应该实现IComparable： - ）。

Answer 14

如果您只是比较相同类型或继承链下的对象，为什么不将参数指定为基类型而不是对象？

也对参数进行空检查。

此外，我只是使用'var'来使代码更具可读性（如果是c＃3代码）

此外，如果对象具有引用类型作为属性，那么您只是在它们上调用ToString（），它们并不真正比较值。如果ToString没有被覆盖，那么它只是将类型名称返回为可能返回误报的字符串。

Answer 15

即使对象不同，这也有效。你可以自定义实用程序类中的方法，也许你想比较私有属性......

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

class ObjectA
{
    public string PropertyA { get; set; }
    public string PropertyB { get; set; }
    public string PropertyC { get; set; }
    public DateTime PropertyD { get; set; }

    public string FieldA;
    public DateTime FieldB;
}

class ObjectB
{
    public string PropertyA { get; set; }
    public string PropertyB { get; set; }
    public string PropertyC { get; set; }
    public DateTime PropertyD { get; set; }


    public string FieldA;
    public DateTime FieldB;


}

class Program
{
    static void Main(string[] args)
    {
        // create two objects with same properties
        ObjectA a = new ObjectA() { PropertyA = "test", PropertyB = "test2", PropertyC = "test3" };
        ObjectB b = new ObjectB() { PropertyA = "test", PropertyB = "test2", PropertyC = "test3" };

        // add fields to those objects
        a.FieldA = "hello";
        b.FieldA = "Something differnt";

        if (a.ComparePropertiesTo(b))
        {
            Console.WriteLine("objects have the same properties");
        }
        else
        {
            Console.WriteLine("objects have diferent properties!");
        }


        if (a.CompareFieldsTo(b))
        {
            Console.WriteLine("objects have the same Fields");
        }
        else
        {
            Console.WriteLine("objects have diferent Fields!");
        }

        Console.Read();
    }
}

public static class Utilities
{
    public static bool ComparePropertiesTo(this Object a, Object b)
    {
        System.Reflection.PropertyInfo[] properties = a.GetType().GetProperties(); // get all the properties of object a

        foreach (var property in properties)
        {
            var propertyName = property.Name;

            var aValue = a.GetType().GetProperty(propertyName).GetValue(a, null);
            object bValue;

            try // try to get the same property from object b. maybe that property does
                // not exist! 
            {
                bValue = b.GetType().GetProperty(propertyName).GetValue(b, null);
            }
            catch
            {
                return false;
            }

            if (aValue == null && bValue == null)
                continue;

            if (aValue == null && bValue != null)
                return false;

            if (aValue != null && bValue == null)
               return false;

            // if properties do not match return false
            if (aValue.GetHashCode() != bValue.GetHashCode())
            {
                return false;
            }
        }

        return true;
    }



    public static bool CompareFieldsTo(this Object a, Object b)
    {
        System.Reflection.FieldInfo[] fields = a.GetType().GetFields(); // get all the properties of object a

        foreach (var field in fields)
        {
            var fieldName = field.Name;

            var aValue = a.GetType().GetField(fieldName).GetValue(a);

            object bValue;

            try // try to get the same property from object b. maybe that property does
            // not exist! 
            {
                bValue = b.GetType().GetField(fieldName).GetValue(b);
            }
            catch
            {
                return false;
            }

            if (aValue == null && bValue == null)
               continue;

            if (aValue == null && bValue != null)
               return false;

            if (aValue != null && bValue == null)
               return false;


            // if properties do not match return false
            if (aValue.GetHashCode() != bValue.GetHashCode())
            {
                return false;
            }
        }

        return true;
    }


}

Answer 16

Liviu上面的答案更新 - 不推荐使用CompareObjects.DifferencesString。

这在单元测试中效果很好：

CompareLogic compareLogic = new CompareLogic();
ComparisonResult result = compareLogic.Compare(object1, object2);
Assert.IsTrue(result.AreEqual);

Answer 17

此方法将获得该类的properties并比较每个property的值。如果任何值不同，它将return false，否则它将return true。

public static bool Compare<T>(T Object1, T object2)
{
    //Get the type of the object
    Type type = typeof(T);

    //return false if any of the object is false
    if (Object1 == null || object2 == null)
        return false;

    //Loop through each properties inside class and get values for the property from both the objects and compare
    foreach (System.Reflection.PropertyInfo property in type.GetProperties())
    {
        if (property.Name != "ExtensionData")
        {
            string Object1Value = string.Empty;
            string Object2Value = string.Empty;
            if (type.GetProperty(property.Name).GetValue(Object1, null) != null)
                Object1Value = type.GetProperty(property.Name).GetValue(Object1, null).ToString();
            if (type.GetProperty(property.Name).GetValue(object2, null) != null)
                Object2Value = type.GetProperty(property.Name).GetValue(object2, null).ToString();
            if (Object1Value.Trim() != Object2Value.Trim())
            {
                return false;
            }
        }
    }
    return true;
}

<强>用法：

bool isEqual = Compare<Employee>(Object1, Object2)

Answer 18

为了扩展@nawfal：s的答案，我使用它来测试单元测试中不同类型的对象，以比较相同的属性名称。在我的案例数据库实体和DTO。

在我的测试中使用这样的;

Assert.IsTrue(resultDto.PublicInstancePropertiesEqual(expectedEntity));



public static bool PublicInstancePropertiesEqual<T, Z>(this T self, Z to, params string[] ignore) where T : class
{
    if (self != null && to != null)
    {
        var type = typeof(T);
        var type2 = typeof(Z);
        var ignoreList = new List<string>(ignore);
        var unequalProperties =
           from pi in type.GetProperties(BindingFlags.Public | BindingFlags.Instance)
           where !ignoreList.Contains(pi.Name)
           let selfValue = type.GetProperty(pi.Name).GetValue(self, null)
           let toValue = type2.GetProperty(pi.Name).GetValue(to, null)
           where selfValue != toValue && (selfValue == null || !selfValue.Equals(toValue))
           select selfValue;
           return !unequalProperties.Any();
    }
    return self == null && to == null;
}

Answer 19

有时你不想比较所有的公共属性，只想比较它们的子集，所以在这种情况下你可以移动逻辑来比较所需的属性列表到抽象类

public class Meters : ValueObject<Meters>
{
    ...

    protected decimal DistanceInMeters { get; private set; }

    ...

    protected override IEnumerable<object> GetAttributesToIncludeInEqualityCheck()
    {
        return new List<Object> { DistanceInMeters };
    }
}

稍后使用此抽象类来比较对象

password_hash()

Answer 20

我的解决方案受到了上面Aras Alenin回答的启发，我在其中添加了一个对象比较级别和一个用于比较结果的自定义对象。我也有兴趣获得对象名称的属性名称：

    public static IEnumerable<ObjectPropertyChanged> GetPublicSimplePropertiesChanged<T>(this T previous, T proposedChange,
     string[] namesOfPropertiesToBeIgnored) where T : class
    {
        return GetPublicGenericPropertiesChanged(previous, proposedChange, namesOfPropertiesToBeIgnored, true, null, null);
    }

    public static IReadOnlyList<ObjectPropertyChanged> GetPublicGenericPropertiesChanged<T>(this T previous, T proposedChange,
        string[] namesOfPropertiesToBeIgnored) where T : class
    {
        return GetPublicGenericPropertiesChanged(previous, proposedChange, namesOfPropertiesToBeIgnored, false, null, null);
    }

    /// <summary>
    /// Gets the names of the public properties which values differs between first and second objects.
    /// Considers 'simple' properties AND for complex properties without index, get the simple properties of the children objects.
    /// </summary>
    /// <typeparam name="T"></typeparam>
    /// <param name="previous">The previous object.</param>
    /// <param name="proposedChange">The second object which should be the new one.</param>
    /// <param name="namesOfPropertiesToBeIgnored">The names of the properties to be ignored.</param>
    /// <param name="simpleTypeOnly">if set to <c>true</c> consider simple types only.</param>
    /// <param name="parentTypeString">The parent type string. Meant only for recursive call with simpleTypeOnly set to <c>true</c>.</param>
    /// <param name="secondType">when calling recursively, the current type of T must be clearly defined here, as T will be more generic (using base class).</param>
    /// <returns>
    /// the names of the properties
    /// </returns>
    private static IReadOnlyList<ObjectPropertyChanged> GetPublicGenericPropertiesChanged<T>(this T previous, T proposedChange,
        string[] namesOfPropertiesToBeIgnored, bool simpleTypeOnly, string parentTypeString, Type secondType) where T : class
    {
        List<ObjectPropertyChanged> propertiesChanged = new List<ObjectPropertyChanged>();

        if (previous != null && proposedChange != null)
        {
            var type = secondType == null ? typeof(T) : secondType;
            string typeStr = parentTypeString + type.Name + ".";
            var ignoreList = namesOfPropertiesToBeIgnored.CreateList();
            IEnumerable<IEnumerable<ObjectPropertyChanged>> genericPropertiesChanged =
                from pi in type.GetProperties(BindingFlags.Public | BindingFlags.Instance)
                where !ignoreList.Contains(pi.Name) && pi.GetIndexParameters().Length == 0 
                    && (!simpleTypeOnly || simpleTypeOnly && pi.PropertyType.IsSimpleType())
                let firstValue = type.GetProperty(pi.Name).GetValue(previous, null)
                let secondValue = type.GetProperty(pi.Name).GetValue(proposedChange, null)
                where firstValue != secondValue && (firstValue == null || !firstValue.Equals(secondValue))
                let subPropertiesChanged = simpleTypeOnly || pi.PropertyType.IsSimpleType()
                    ? null
                    : GetPublicGenericPropertiesChanged(firstValue, secondValue, namesOfPropertiesToBeIgnored, true, typeStr, pi.PropertyType)
                let objectPropertiesChanged = subPropertiesChanged != null && subPropertiesChanged.Count() > 0
                    ? subPropertiesChanged
                    : (new ObjectPropertyChanged(proposedChange.ToString(), typeStr + pi.Name, firstValue.ToStringOrNull(), secondValue.ToStringOrNull())).CreateList()
                select objectPropertiesChanged;

            if (genericPropertiesChanged != null)
            {   // get items from sub lists
                genericPropertiesChanged.ForEach(a => propertiesChanged.AddRange(a));
            }
        }
        return propertiesChanged;
    }

使用以下类存储比较结果

[System.Serializable]
public class ObjectPropertyChanged
{
    public ObjectPropertyChanged(string objectId, string propertyName, string previousValue, string changedValue)
    {
        ObjectId = objectId;
        PropertyName = propertyName;
        PreviousValue = previousValue;
        ProposedChangedValue = changedValue;
    }

    public string ObjectId { get; set; }

    public string PropertyName { get; set; }

    public string PreviousValue { get; set; }

    public string ProposedChangedValue { get; set; }
}

样本单元测试：

    [TestMethod()]
    public void GetPublicGenericPropertiesChangedTest1()
    {
        // Define objects to test
        Function func1 = new Function { Id = 1, Description = "func1" };
        Function func2 = new Function { Id = 2, Description = "func2" };
        FunctionAssignment funcAss1 = new FunctionAssignment
        {
            Function = func1,
            Level = 1
        };
        FunctionAssignment funcAss2 = new FunctionAssignment
        {
            Function = func2,
            Level = 2
        };

        // Main test: read properties changed
        var propertiesChanged = Utils.GetPublicGenericPropertiesChanged(funcAss1, funcAss2, null);

        Assert.IsNotNull(propertiesChanged);
        Assert.IsTrue(propertiesChanged.Count == 3);
        Assert.IsTrue(propertiesChanged[0].PropertyName == "FunctionAssignment.Function.Description");
        Assert.IsTrue(propertiesChanged[1].PropertyName == "FunctionAssignment.Function.Id");
        Assert.IsTrue(propertiesChanged[2].PropertyName == "FunctionAssignment.Level");
    }

比较c＃中的对象属性

20 个答案: