EF代码优先:如何在nuget包控制台中看到'EntityValidationErrors‘属性？
我对此感到困惑：
我已经为实体框架(4.1.3)代码优先方法定义了我的类。一切都很好(我正在创建表等等)直到我开始播种。
现在当我这样做时
Add-Migration "remigrate" ; Update-Database;我在包控制台上得到一个错误“验证一个或多个实体失败。有关更多详细信息，请参阅'EntityValidationErrors‘属性。”
我的Seed()方法中有一个断点，但是因为我是在项目不运行的时候在控制台上运行这个断点的，所以我不知道如何获取细节(PS -我已经看到了线程Validation failed for one or more entities while saving changes to SQL Server Database using Entity Framework，它显示了如何查看属性)。
我知道我的Seed()方法有问题，因为如果我在方法调用后立即返回，错误就会消失。那么，我如何设置断点，以便查看验证错误是什么呢？有点迷失了。或者，是否有其他方法可以在nuget控制台中跟踪它？
回答 5
Stack Overflow用户
发布于 2012-05-21 03:32:59
我最近也被这件事惹恼了。我通过在种子方法的Configuration类中放置一个包装器函数来修复它，并将对SaveChanges的调用替换为对我的函数的调用。此函数将简单地枚举EntityValidationErrors集合中的错误，并在异常消息列出各个问题的情况下重新抛出异常。这会使输出显示在NuGet包管理器控制台中。
代码如下：
/// <summary>
/// Wrapper for SaveChanges adding the Validation Messages to the generated exception
/// </summary>
/// <param name="context">The context.</param>
private void SaveChanges(DbContext context) {
try {
context.SaveChanges();
} catch (DbEntityValidationException ex) {
StringBuilder sb = new StringBuilder();
foreach (var failure in ex.EntityValidationErrors) {
sb.AppendFormat("{0} failed validation\n", failure.Entry.Entity.GetType());
foreach (var error in failure.ValidationErrors) {
sb.AppendFormat("- {0} : {1}", error.PropertyName, error.ErrorMessage);
sb.AppendLine();
}
}
throw new DbEntityValidationException(
"Entity Validation Failed - errors follow:\n" +
sb.ToString(), ex
); // Add the original exception as the innerException
}
}只需在种子方法中将对context.SaveChanges()的调用替换为SaveChanges(context)即可。
Stack Overflow用户
发布于 2013-03-13 05:46:03
我将Richards的答案转换为扩展方法：
public static int SaveChangesWithErrors(this DbContext context)
{
try
{
return context.SaveChanges();
}
catch (DbEntityValidationException ex)
{
StringBuilder sb = new StringBuilder();
foreach (var failure in ex.EntityValidationErrors)
{
sb.AppendFormat("{0} failed validation\n", failure.Entry.Entity.GetType());
foreach (var error in failure.ValidationErrors)
{
sb.AppendFormat("- {0} : {1}", error.PropertyName, error.ErrorMessage);
sb.AppendLine();
}
}
throw new DbEntityValidationException(
"Entity Validation Failed - errors follow:\n" +
sb.ToString(), ex
); // Add the original exception as the innerException
}
}像这样调用：
context.SaveChangesWithErrors();Stack Overflow用户
发布于 2012-10-27 00:52:40
我将craigvl的版本转换为C#，我必须添加context.SaveChanges()；才能让它为我工作，如下所示。
try
{
byte[] bytes = System.IO.File.ReadAllBytes(@"C:\Users\sheph_000\Desktop\Rawr.png");
Console.WriteLine(bytes);
context.BeverageTypes.AddOrUpdate(
x => x.Name,
new AATPos.DAL.Entities.BeverageType { ID = 1, Name = "Sodas" }
);
context.Beverages.AddOrUpdate(
x => x.Name,
new AATPos.DAL.Entities.Beverage { ID = 1, Name = "Coke", BeverageTypeID = 1, ImageData = bytes, IsStocked = true, StockLevel = 10, Price = 10.00M, ImageMimeType = "test" },
new AATPos.DAL.Entities.Beverage { ID = 2, Name = "Fanta", BeverageTypeID = 1, ImageData = bytes, IsStocked = true, StockLevel = 10, Price = 10.00M, ImageMimeType = "test" },
new AATPos.DAL.Entities.Beverage { ID = 3, Name = "Sprite", BeverageTypeID = 1, ImageData = bytes, IsStocked = true, StockLevel = 10, Price = 10.00M, ImageMimeType = "test" },
new AATPos.DAL.Entities.Beverage { ID = 4, Name = "Cream Soda", BeverageTypeID = 1, ImageData = bytes, IsStocked = true, StockLevel = 10, Price = 10.00M, ImageMimeType = "test" },
new AATPos.DAL.Entities.Beverage { ID = 5, Name = "Pepsi", BeverageTypeID = 1, ImageData = bytes, IsStocked = true, StockLevel = 10, Price = 10.00M, ImageMimeType = "test" }
);
context.SaveChanges();
}
catch (System.Data.Entity.Validation.DbEntityValidationException ex)
{
var sb = new System.Text.StringBuilder();
foreach (var failure in ex.EntityValidationErrors)
{
sb.AppendFormat("{0} failed validation", failure.Entry.Entity.GetType());
foreach (var error in failure.ValidationErrors)
{
sb.AppendFormat("- {0} : {1}", error.PropertyName, error.ErrorMessage);
sb.AppendLine();
}
}
throw new Exception(sb.ToString());
}https://stackoverflow.com/questions/10219864
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