数据实体插入：具有相同密钥的项目已被添加

我知道这个问题已经被询问了很多次，并且在通过帖子后，我认为它与实体名称有关，但我对数据完全陌生实体模型，并试图做一个简单的博客条目插入博客的细节，我遇到了这个问题。数据实体插入：具有相同密钥的项目已被添加

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.ArgumentException: An item with the same key has already been added. 

Source Error: 

Line 365: public void AddToblogs(blog blog) 
Line 366: { 
Line 367:  base.AddObject("myblogs", blog); 
Line 368: } 
Line 369: 


Source File: C:\Inetpub\int422_113b16\webcontent\App_Code\blogModel.cs Line: 367 

Stack Trace: 

[ArgumentException: An item with the same key has already been added.] 
    System.ThrowHelper.ThrowArgumentException(ExceptionResource resource) +52 
    System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add) +9382923 
    System.Data.Metadata.Edm.ObjectItemAttributeAssemblyLoader.LoadRelationshipTypes() +661 
    System.Data.Metadata.Edm.ObjectItemAttributeAssemblyLoader.LoadTypesFromAssembly() +17 
    System.Data.Metadata.Edm.ObjectItemAssemblyLoader.Load() +25 
    System.Data.Metadata.Edm.ObjectItemAttributeAssemblyLoader.Load() +4 
    System.Data.Metadata.Edm.AssemblyCache.LoadAssembly(Assembly assembly, Boolean loadReferencedAssemblies, ObjectItemLoadingSessionData loadingData) +160 
    System.Data.Metadata.Edm.AssemblyCache.LoadAssembly(Assembly assembly, Boolean loadReferencedAssemblies, KnownAssembliesSet knownAssemblies, EdmItemCollection edmItemCollection, Action`1 logLoadMessage, Object& loaderCookie, Dictionary`2& typesInLoading, List`1& errors) +166 
    System.Data.Metadata.Edm.ObjectItemCollection.LoadAssemblyFromCache(ObjectItemCollection objectItemCollection, Assembly assembly, Boolean loadReferencedAssemblies, EdmItemCollection edmItemCollection, Action`1 logLoadMessage) +316 
    System.Data.Metadata.Edm.ObjectItemCollection.ImplicitLoadAssemblyForType(Type type, EdmItemCollection edmItemCollection) +84 
    System.Data.Metadata.Edm.MetadataWorkspace.ImplicitLoadAssemblyForType(Type type, Assembly callingAssembly) +151 
    System.Data.Objects.ObjectContext.AddObject(String entitySetName, Object entity) +211 
    blogEntities.AddToblogs(blog blog) in C:\Inetpub\int422_113b16\webcontent\App_Code\blogModel.cs:367 
    BlogManager.BlogAdd(String title, String content, String userName) in C:\Inetpub\int422_113b16\webcontent\App_Code\BlogManager.cs:27 
    Project_Admin_create_post.post_Click(Object sender, EventArgs e) in C:\Inetpub\int422_113b16\webcontent\Project\Admin\create-post.aspx.cs:25 
    System.Web.UI.WebControls.Button.OnClick(EventArgs e) +118 
    System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +112 
    System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10 
    System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13 
    System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +36 
    System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5563

BlogManager.cs

public class BlogManager 
{ 
    private blogEntities _dbEnt = new blogEntities(); 

    public BlogManager() 
    { 
    } 

    public void BlogAdd(int numId, string title, string content,string userName) 
    { 

     blog newPost = new blog(); 
     newPost.blog_id = 1; 
     newPost.blog_title = title; 
     newPost.blog_content = content; 
     newPost.date_created = null; 
     newPost.user_name = userName; 

     _dbEnt.AddTotheblog(newPost); 
     _dbEnt.SaveChanges(); 
    } 

    public class NameNotUniqueException : Exception 
    { 
     public NameNotUniqueException(string msg = "INT422 ERROR: matching data already exists") 
      : base(msg) 
     { } 
    } 
}

创建-post.cs

public partial class Project_Admin_create_post : System.Web.UI.Page 
{ 
    protected void Page_Load(object sender, EventArgs e) 
    { 
     if (IsPostBack) 
     { 
      blogStatus.Text = "Your post is published"; 
      title.Enabled = false; 
      content.Enabled = false; 
     } 
    } 

    protected void post_Click(object sender, EventArgs e) 
    { 
     string _userName = User.Identity.Name; 

     BlogManager blogMgr = new BlogManager(); 
     blogMgr.BlogAdd(title.Text, content.Text, _userName); 
    } 
}

来源

2011-11-27 Bhrugesh Patel

我认为错误消息在这里告诉你真相。以前，无论是在博客文章中的子对象还是博客文章本身，都会使用相同的实体关键字添加另一个此类型的实体。

是否有可能在您的某个表中忘记为您的PK设置身份密钥？如果是这样，你可能会有一个键为0的行，并且随后的插入与它冲突。

来源

2011-11-27 17:16:17

代码用我用于插入的文件更新。让我知道如果你正在寻找任何其他特定的文件 –

@BhrugeshPatel - 请参阅我的编辑 –

一切仍然是相同的..我有PK，身份密钥和我手动添加数字..问题仍然存在 –

if(blog.EntityState==EntityState.Detached) 
    base.AddObject("myblogs", blog);

来源

2011-11-27 17:21:04

问题依然存在〜_〜 –

什么是博客PK？你忘记赋值了吗？ –

其blog_id ..而不是自动assign..did它手动... 检查方法的更新代码BlogAdd（..） –

数据实体插入：具有相同密钥的项目已被添加

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