Catch System.Data.SqlClient.SqlException错误(Catch System.Data.SqlClient.SqlException error)

 当我尝试访问我的ASP.NET Web应用程序上没有任何网络连接的网页时，我遇到了异常System.Data.SqlClient.SqlException 。 
 
 我试图通过使用try catch来捕获异常，但它不起作用。 以下是我的代码段： 
 
protected void Page_Load(object sender, EventArgs e)
{
    try
    {
        SqlDataSource1.SelectCommand = "SELECT * FROM [UserDB]";
        SqlDataSource1.DataBind();
    }
    catch (SqlException ex)
    {
        Response.Redirect("/App/ErrorPage.aspx");
    }
}
 
 我的try catch工作在我的网页本身的其他功能上。 例如，如果用户在未连接到网络时尝试删除记录，则会显示ErrorPage。 但是对于pageload方法，try catch没有按预期工作，错误显示为下面的网页： 
 
 谁能告诉我哪里出错了？ 
 
 谢谢 

I have met the exception System.Data.SqlClient.SqlException when I tried to access a webpage on my ASP.NET web application without any network connection. 
 
I have tried to catch the exception by using a try catch, however it does not work. Below is my code snippet:
 
protected void Page_Load(object sender, EventArgs e)
{
    try
    {
        SqlDataSource1.SelectCommand = "SELECT * FROM [UserDB]";
        SqlDataSource1.DataBind();
    }
    catch (SqlException ex)
    {
        Response.Redirect("/App/ErrorPage.aspx");
    }
}
 
My try catch worked on other functions within my webpage itself. E.g. ErrorPage will be shown if user try to delete record when not connected to network. But as for the pageload method, the try catch did not work as expected, and the error showed as the webpage below: 
 
Anyone can tell me where I have gone wrong?
 
Thank you

原文：https://stackoverflow.com/questions/8239239