有关于GridView和Server.Transfer、Execute的话题

最新推荐文章于 2021-12-04 07:58:10 发布

转载最新推荐文章于 2021-12-04 07:58:10 发布 · 66 阅读

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原文链接：http://www.cnblogs.com/RuiLei/archive/2009/06/17/1505415.html

本文探讨了在ASP.NET开发中使用GridView与Server.Transfer时遇到的异常问题，并提供了详细的解决方案。文章介绍了如何避免ThreadAbortException异常及“无法评估表达式”的问题。

相信大家都使用GridView，以及Server.Transfer，不知道在开发中是否遇到这种情况？

当Page A Nest(嵌套)在MasterPage，再在Page A 中放个GridView进行显示数据或者数据处理什么的。

那数据显示之后，想直接跳转到其他页面，进行操作什么的？

那此时的跳转页面动作

一般都会使用Response.Redirect(@”~/Other.Page”,false);

那你有想到使用Server.Transfer 或者 Server.Execute 吗？ OK，当然

不过，你在使用以上两种方式时，程序一定会发生Exception.

为什么？不信的我的话，可以花时间去试试就知道了。

那以下我想说说如何解决此问题？(此问题也许大家经常会遇到)

症状1：ThreadAbortException

引用微软问题

说明：

If you use the Response.End, Response.Redirect, or Server.Transfer method, a ThreadAbortException exception occurs. You can use a try-catch statement to catch this exception.

原因：

The Response.End method ends the page execution and shifts the execution to the Application_EndRequest event in the application's event pipeline. The line of code that follows Response.End is not executed.
This problem occurs in the Response.Redirect and Server.Transfer methods because both methods call Response.End internally.

解决：

For Response.End, call the HttpContext.Current.ApplicationInstance.CompleteRequest method instead of Response.End to bypass the code execution to the Application_EndRequest event.

For Response.Redirect, use an overload, Response.Redirect(String url, bool endResponse) that passes false for the endResponse parameter to suppress the internal call to Response.End. For example:

  Response.Redirect ("nextpage.aspx", );

If you use this workaround, the code that follows Response.Redirect is executed.

- For Server.Transfer, use the Server.Execute method instead.

前一个异常解决，紧接着可能又会出现下一个异常，如下：

症状2：Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack

先谢谢 Nishant Sharma

原因：

This problem occurs in the Response.Redirect and Server.Transfer methods because both methods call Response.End internally.

解决方案：

HttpContext.Current.Response.End();

to the finally block and it works perfectly.

When Response.Redirect is moved from try block to finally block it worked .

Code:

 protected void imgBtnManage_Click ( object sender , ImageClickEventArgs e ) {
            try {
                Test = "OK";
                //两种方法任选一种
                //Server.Transfer( @"~/WebForm2.aspx" , true );
                //Server.Execute( @"~/WebForm2.aspx" , true );
            }
            catch ( ThreadAbortException threadAbortException ) {
            }
            catch ( Exception ex ) {
            }
            finally {
                ///When Response.Redirect is moved from try block to finally block it worked .
                HttpContext.Current.Response.End();
            }
        }

private string test;

        public string Test {
            get { return test; }
            set { test = value; }
        }

另附上：GridView的原始布局

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
    <asp:GridView ID="gvTransactions" runat="server" AutoGenerateColumns="False" DataKeyNames="sequence_id"
        DataSourceID="SqlDataSource1">
        <Columns>
            <asp:ButtonField HeaderText="Username" CommandName="Select" DataTextField="sequence_id"
                ButtonType="Link" />
            <asp:BoundField DataField="message" HeaderText="message" SortExpression="message" />
            <asp:TemplateField HeaderText="操作" ItemStyle-Width="100">
                <ItemTemplate>
                    <asp:ImageButton ID="imgBtnManage" runat="server" ImageUrl="~/WebResources/Images/Manage.gif"
                        OnClick="imgBtnManage_Click" />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
</asp:Content>

例子下载：http://files.cnblogs.com/RuiLei/GridViewServerTransfer.rar

*没有解决不了的问题，就看是否为此付出！

转载于:https://www.cnblogs.com/RuiLei/archive/2009/06/17/1505415.html