关于SqlException 异常的创建问题。

我的问题是怎样实例化一个SqlException类异常哪？

查看MSDN后发现  System.Data.SqlClient.SqlException.CreateExceptioin是用来实例化SqlException的，但是它被标注为internal。所以不在通过正常手段调用它。

请问谁有好为法，不吝赐教。 --------------------编程问答-------------------- try catch

或者

throw new Exception(""); --------------------编程问答-------------------- 貌似不让吧?为什么非要实例化一个这样的类呢?
你可以自己定义一个异常类型来实现的. --------------------编程问答-------------------- 数十天之前发的贴子，自己找到答案了，自己回答。

//http://blogs.msdn.com/b/rido/archive/2006/11/26/mocking-sqlexception.aspx
/*
Mocking SQLException

Rido

26 Nov 2006 8:30 AM

I'm working on a presentation about Testing, and one of the technics I would like to show is MockObjects.

One of the mock objects I want to create is a DataAccess Layer, and this one should throw SqlExceptions, however the SqlException class is sealed and has no public constructor.

I found a comment about it here: http://www.taylor.se/blog/2006/06/09/mocking-sqlexception/

But the implementation does not work with .Net2, so I have to refactor the code to create a SqlExceptionCreator, and here it is:
*/
using System;
using System.Data.SqlClient;
using System.Reflection;
using System.Runtime.Serialization;

public class SqlExceptionCreator
{
    public static SqlException CreateSqlException(string errorMessage, int errorNumber)
    {
        SqlErrorCollection collection = GetErrorCollection();
        SqlError error = GetError(errorNumber, errorMessage);
        MethodInfo addMethod = collection.GetType().

        GetMethod("Add", BindingFlags.NonPublic | BindingFlags.Instance);

        addMethod.Invoke(collection, new object[] { error });

        Type[] types = new Type[] { typeof(string), typeof(SqlErrorCollection) };

        object[] parameters = new object[] { errorMessage, collection };

        ConstructorInfo constructor = typeof(SqlException).

            GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, types, null);

        SqlException exception = (SqlException)constructor.Invoke(parameters);

        return exception;
    }

    private static SqlError GetError(int errorCode, string message)
    {

        object[] parameters = new object[] {

            errorCode, (byte)0, (byte)10, "server", message, "procedure", 0 };

        Type[] types = new Type[] {

            typeof(int), typeof(byte), typeof(byte), typeof(string), typeof(string),

            typeof(string), typeof(int) };

        ConstructorInfo constructor = typeof(SqlError).

            GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, types, null);

        SqlError error = (SqlError)constructor.Invoke(parameters);

        return error;

    }

    private static SqlErrorCollection GetErrorCollection()
    {

        ConstructorInfo constructor = typeof(SqlErrorCollection).

            GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, new Type[] { }, null);

        SqlErrorCollection collection = (SqlErrorCollection)constructor.Invoke(new object[] { });

        return collection;

    }

}

补充：.NET技术 ,  .NET Framework