从另一个具有dictionary <string,object>属性并具有不同键值对的对象构建动态对象

时间:2019-06-04 19:14:56

标签: c# dynamicobject

我正在尝试从包含一些静态属性的现有对象中整理属性。该对象还包含带有键值对的字典。这些键值对应作为属性动态添加到我正在创建的新对象中。

这是源对象的设置:

public class MyClass
{
    public string PropA { get; set; }
    public string PropB { get; set; }
    public string PropC { get; set; }

    public IDictionary<string, NameValuePair> PropD { get; set; }
}

public class NameValuePair
{
    public string Name { get; set; }
    public string Value { get; set; }
}

这是我创建对象列表的地方:

void Main()
{

    var data = new List<MyClass>
    {
        new MyClass {PropA = "A1", PropB = "B1", PropC = "C1", PropD = new Dictionary<string, NameValuePair>
        {
            { "Code11", new NameValuePair {Name = "PropD11", Value = "V11"}},
            { "Code12", new NameValuePair {Name = "PropD12", Value = "V12"}}
        }},
        new MyClass {PropA = "A2", PropB = "B2", PropC = "C2", PropD = new Dictionary<string, NameValuePair>
        {
            { "Code21", new NameValuePair {Name = "PropD21", Value = "V21"}},
            { "Code22", new NameValuePair {Name = "PropD22", Value = "V22"}},
        }},
        new MyClass {PropA = "A3", PropB = "B3", PropC = "C3", PropD = new Dictionary<string, NameValuePair>
        {
            { "Code12", new NameValuePair {Name = "PropD12", Value = "V31"}},
            { "Code21", new NameValuePair {Name = "PropD21", Value = "V32"}},
        }},
    };
//Extract column names from static properties
    var staticColumns = typeof(MyClass).GetProperties().Where(n => n.PropertyType == typeof(string)).Select(p => p.Name);

//Extract column names from the dictionary
    var dynamicColumns = data.Where(c => c.PropD.Any()).Select(c => c.PropD).SelectMany(c => c.Values.Select(v => v.Name)).Distinct().ToList();

//Combine to get a new list of columns 
    var columns = staticColumns.Union(dynamicColumns);

//Create object using columns

//Copy values from data to construct the new object.    
}

我需要在运行时构造对象的逻辑方面的帮助,该对象具有以下结构并正确映射了数据。

PropA    PropB    PropC  PropD11  PropD12  PropD21  PropD22
------------------------------------------------------------
A1       B1       C1     V11      V12       
A2       B2       C2                       V21      V22
A3       B3       C3              V31      V32  

1 个答案:

答案 0 :(得分:1)

假设您可能的属性名称是静态的,这是一个答案类:

public class AnsClass {
    public string PropA { get; set; }
    public string PropB { get; set; }
    public string PropC { get; set; }

    public string PropD11 { get; set; }
    public string PropD12 { get; set; }
    public string PropD21 { get; set; }
    public string PropD22 { get; set; }
}

这是一个LINQ语句来创建它们的列表:

var ans = data.Select(d => new AnsClass {
                    PropA = d.PropA,
                    PropB = d.PropB,
                    PropC = d.PropC,
                    PropD11 = d.PropD.Values.FirstOrDefault(v => v.Name == "PropD11")?.Value,
                    PropD12 = d.PropD.Values.FirstOrDefault(v => v.Name == "PropD12")?.Value,
                    PropD21 = d.PropD.Values.FirstOrDefault(v => v.Name == "PropD21")?.Value,
                    PropD22 = d.PropD.Values.FirstOrDefault(v => v.Name == "PropD22")?.Value,
                })
                .ToList();

如果PropD的成员是动态的,则可以使用以下内容来创建ExpandoObjects,但实际上最好使用MyClass,因为它具有最佳的设计为此。

var ans2 = new List<dynamic>();
foreach (var d in data) {
    dynamic eo = new ExpandoObject();
    eo.PropA = d.PropA;
    eo.PropB = d.PropB;
    eo.PropC = d.PropC;
    var deo = (IDictionary<string,object>)eo;
    foreach (var dp in d.PropD.Values)
        deo.Add(dp.Name, dp.Value);
    ans2.Add(eo);
}