Question

我在这里有一些查找图像的代码，但是如果图像不存在则应该显示一些错误文本。它只是显示损坏的图像，不使用错误文本。在调试时，我看到catch异常看到404错误，但它只是跳过异常响应文本。这是我的代码：

protected void Page_Load(object sender, EventArgs e)
{
    checkMember(true);

    string acctNumber = Request["acctNum"];
    if (member.findAcct(acctNumber, "CheckImage") != null)
    {
        try
        {
            Response.ContentType = "image/jpeg";
            Response.BinaryWrite(((Member)member).checkImage(acctNumber, Request["ckNum"],DateTime.Parse(Request["date"]), Request["amt"], Request["checkSide"]));
        }
        catch (Exception ex)
        {
            Response.ContentType = "text";
            Response.Write("Error retrieving check image: "+ ex.Message);
        }
    }
    Response.End();

它刚刚跳过：

catch (Exception ex)
{
    Response.ContentType = "text";
    Response.Write("Error retrieving check image: "+ ex.Message);
}

Answer 1

也许你没有得到异常，你的if语句只是返回false？添加一个else来处理错误...

string acctNumber = Request["acctNum"];
if (member.findAcct(acctNumber, "CheckImage") != null)
{
     try
     {
         Response.ContentType = "image/jpeg";
         Response.BinaryWrite(((Member)member).checkImage(acctNumber, Request["ckNum"],DateTime.Parse(Request["date"]), Request["amt"], Request["checkSide"]));
     }
     catch (Exception ex)
     {
         Response.ContentType = "text";
         Response.Write("Error retrieving check image: " + ex.Message);
     }
}
else
{
     Response.ContentType = "text";
     //Exception Message can´t be referenced here
     Response.Write("Error retrieving check image");
}

如何显示错误消息？

1 个答案: