Question

我是Ado网的新手。我正在使用EF 6。

我有2个表UserInfo和UserType。

现在，当我想获取userInfo时，我想将UserTypeName设置为与其他UserInfo一起显示在网格中，为此我使用了下面的代码。

public List<UserInfoBind> SearchBindUser(UserInfo objSeacrh)
        {
            try
            {                     
                List<UserInfoBind> objList = (from sql in dbContext.UserInfoes.Where(t => t.IsDelete != true)
                                              join tblType in dbContext.UserTypes
                                              on sql.UserType equals tblType.UserTypeID
                                              select new UserInfoBind()
                                               {
                                                   UserTypeName = tblType.UserTypeName
                                               }).ToList();
                return objList;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

和Decalre UserInforBind如下：

 [DataContract]
    public class UserInfoBind : UserInfo
    {  
        public UserInfoBind()
        {

        }

        [DataMember]
        public string UserTypeName { get; set; }
    }

但它给出了错误：＆＃34;输入＆＃39; DAL.UserInfoBind＆＃39;不能从未标记为DataContractAttribute或SerializableAttribute的类型继承。＆＃34;

那么如何在EF 6中创建Userinfo表实体的SerializableAttribute。谢谢， Hitesh Paghadal

Answer 1

有两种方法可以达到你想要的效果。

如果要使用用于表示WCF DataContract的数据库模型的相同类型，则需要使用DataContract属性标记实体，并使用DataMember属性标记属性。我假设您正在使用Database First方法，如果是，您可以更改代码生成模板以使用DataContract属性标记所有实体，并使用DataMember属性标记所有属性。

另一种方法是保持数据库类型不变，为DataContract创建新的类型集，并使用AutoMapper等工具映射所需的属性。

我更喜欢第二种方法，因为它允许您更改底层模型，而不会影响通过WCF服务公开的内容。

修改：如果您想使用编辑代码模板，那么就是这样做的

在您的EDMX文件中，您将看到两个扩展名为.tt的文件。一个用于数据上下文，一个用于模型。打开一个create for model并进行以下更改

// To add DataMember attibute in all the properties
// Change


public string Property(EdmProperty edmProperty)
    {
        return string.Format(
            CultureInfo.InvariantCulture,
            "{0} {1} {2} {{ {3}get; {4}set; }}",
            Accessibility.ForProperty(edmProperty),
            _typeMapper.GetTypeName(edmProperty.TypeUsage),
            _code.Escape(edmProperty),
            _code.SpaceAfter(Accessibility.ForGetter(edmProperty)),
            _code.SpaceAfter(Accessibility.ForSetter(edmProperty)));
    }

// To

public string Property(EdmProperty edmProperty)
{
    return string.Format(
        CultureInfo.InvariantCulture,
        "[DataMember] {0} {1} {2} {{ {3}get; {4}set; }}",
        Accessibility.ForProperty(edmProperty),
        _typeMapper.GetTypeName(edmProperty.TypeUsage),
        _code.Escape(edmProperty),
        _code.SpaceAfter(Accessibility.ForGetter(edmProperty)),
        _code.SpaceAfter(Accessibility.ForSetter(edmProperty)));
}

// To add DataMember attibute in all the navigation properties
// Change

public string NavigationProperty(NavigationProperty navProp)
{
    var endType = _typeMapper.GetTypeName(navProp.ToEndMember.GetEntityType());
    return string.Format(
        CultureInfo.InvariantCulture,
        "{0} {1} {2} {{ {3}get; {4}set; }}",
        AccessibilityAndVirtual(Accessibility.ForNavigationProperty(navProp)),
        navProp.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many ? ("ICollection<" + endType + ">") : endType,
        _code.Escape(navProp),
        _code.SpaceAfter(Accessibility.ForGetter(navProp)),
        _code.SpaceAfter(Accessibility.ForSetter(navProp)));
}

// TO

public string NavigationProperty(NavigationProperty navProp)
{
    var endType = _typeMapper.GetTypeName(navProp.ToEndMember.GetEntityType());
    return string.Format(
        CultureInfo.InvariantCulture,
        "[DataMember] {0} {1} {2} {{ {3}get; {4}set; }}",
        AccessibilityAndVirtual(Accessibility.ForNavigationProperty(navProp)),
        navProp.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many ? ("ICollection<" + endType + ">") : endType,
        _code.Escape(navProp),
        _code.SpaceAfter(Accessibility.ForGetter(navProp)),
        _code.SpaceAfter(Accessibility.ForSetter(navProp)));
}

// To add DataContract attibute in all the types
// Change

public string EntityClassOpening(EntityType entity)
{
    return string.Format(
        CultureInfo.InvariantCulture,
        "{0} {1}partial class {2}{3}",
        Accessibility.ForType(entity),
        _code.SpaceAfter(_code.AbstractOption(entity)),
        _code.Escape(entity),
        _code.StringBefore(" : ", _typeMapper.GetTypeName(entity.BaseType)));
}

// To


public string EntityClassOpening(EntityType entity)
    {
        return string.Format(
            CultureInfo.InvariantCulture,
            "[DataContract] {0} {1}partial class {2}{3}",
            Accessibility.ForType(entity),
            _code.SpaceAfter(_code.AbstractOption(entity)),
            _code.Escape(entity),
            _code.StringBefore(" : ", _typeMapper.GetTypeName(entity.BaseType)));
    }


// To include System.Runtime.Serialization
// Change



public string UsingDirectives(bool inHeader, bool includeCollections = true)
    {
        return inHeader == string.IsNullOrEmpty(_code.VsNamespaceSuggestion())
            ? string.Format(
                CultureInfo.InvariantCulture,
                "{0}using System;{1}" +
                "{2}",
                inHeader ? Environment.NewLine : "",
                includeCollections ? (Environment.NewLine + "using System.Collections.Generic;") : "",
                inHeader ? "" : Environment.NewLine)
            : "";
    }



  //  To



public string UsingDirectives(bool inHeader, bool includeCollections = true)
{
    return inHeader == string.IsNullOrEmpty(_code.VsNamespaceSuggestion())
        ? string.Format(
            CultureInfo.InvariantCulture,
            "{0}using System;{1}" +
            "using System.Runtime.Serialization;{2}" +
            "{3}",
            inHeader ? Environment.NewLine : "",
            Environment.NewLine,
            includeCollections ? (Environment.NewLine + "using System.Collections.Generic;") : "",
            inHeader ? "" : Environment.NewLine)
        : "";
}

编辑2 ：更改您的select方法以包含UserInfo中的所有属性，否则您的UserInfoBind将只有UserTypeName

select new UserInfoBind()
 { 
    userInfoprop1 = sql.value1,  
    userInfoprop2 = sql.value2, 
    UserTypeName = tblType.UserTypeName
 }).ToList();

如何在EF 6中将表实体添加为Ado net中的可序列化

1 个答案: