C# 实体框架错误ReflectionTypeLoadException

当我试图在数据库中保存数据时，我遇到以下错误：

无法加载一个或多个请求的类型。有关详细信息，请检索LoaderExceptions属性。 使用EF对象的所有操作都会发生此错误，例如，当我执行此操作时（在返回步骤中）：

或此（在AddObject步骤上）：

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好的，因此当您收到此消息时，错误可能会有所不同。我的问题是我安装了EF5，而我引用的另一个项目有4.4，并且存在冲突。 在异常块中执行此代码将帮助您获得确切的消息：

using System.IO;
using System.Reflection;

try
{
    //The code that causes the error goes here.
}
catch (ReflectionTypeLoadException ex)
{
    StringBuilder sb = new StringBuilder();
    foreach (Exception exSub in ex.LoaderExceptions)
    {
        sb.AppendLine(exSub.Message);
        if (exSub is FileNotFoundException)
        {
            FileNotFoundException exFileNotFound = exSub as FileNotFoundException;
            if(!string.IsNullOrEmpty(exFileNotFound.FusionLog))
            {
                sb.AppendLine("Fusion Log:");
                sb.AppendLine(exFileNotFound.FusionLog);
            }
        }
        sb.AppendLine();
    }
    string errorMessage = sb.ToString();
    //Display or log the error based on your application.
}

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最初写在这篇文章中：

的可能副本看起来像是UserInfoes禁用了延迟加载。确保它的UserInfoes是虚拟的。@Smith h.Neil我在发布之前检查了那篇文章，它没有帮助。那么，

LoaderException

属性中有什么？

   public bool AddAdditionalUserInfo(int userId, string firstName, string lastName, string emailAddress)
        {
            try
            {
                UserInfo userInfo = new UserInfo();
                userInfo.UserId = userId;
                userInfo.FirstName = firstName;
                userInfo.LastName = lastName;
                userInfo.EmailAddress = emailAddress;
                userInfo.UserInfoId = 0;
                _db.UserInfoes.AddObject(userInfo);                
                _db.SaveChanges();
                return true;
            }
            catch (Exception ex)
            {
                this._lastError = ex.Message;
                return false;
            }
        }

using System.IO;
using System.Reflection;

try
{
    //The code that causes the error goes here.
}
catch (ReflectionTypeLoadException ex)
{
    StringBuilder sb = new StringBuilder();
    foreach (Exception exSub in ex.LoaderExceptions)
    {
        sb.AppendLine(exSub.Message);
        if (exSub is FileNotFoundException)
        {
            FileNotFoundException exFileNotFound = exSub as FileNotFoundException;
            if(!string.IsNullOrEmpty(exFileNotFound.FusionLog))
            {
                sb.AppendLine("Fusion Log:");
                sb.AppendLine(exFileNotFound.FusionLog);
            }
        }
        sb.AppendLine();
    }
    string errorMessage = sb.ToString();
    //Display or log the error based on your application.
}