错误输入字符串的格式不正确。 [英] Error input string was not in a correct format.

问题描述

Input string was not in a correct format.

我尝试将vb转换为c＃以获取双倍值，但我收到此错误

I try to convert vb to c# for double value but i got this error "

Input string was not in a correct format."

这是VB

Here is VB

If CDbl(TxtBx_ClaimValue.Text) = CDbl(0) Then
    Lbl_Message.Text = "Error. Claim Value ?"
    TxtBx_ClaimValue.Focus()
    Exit Sub
End If

这是C＃

Here is C#

if (Convert.ToDouble(Txtbx_ClaimValue.Text) == (double)0)
{
    Lbl_Message.Text = "Error. Claim Value ?";
    Txtbx_ClaimValue.Focus();
    return;
}

Can somebody please help me?

我尝试了什么：



我不知道什么是代码错误。

What I have tried:

I have no clue what's wrong with the code.

推荐答案

不要对用户输入使用转换操作：如果用户输入错误，它们会抛出异常。

相反，请使用TryParse：

Don't use Convert operations for user input: they throw an exception if the user enters something wrong.
Instead, use TryParse:

double d;
if (!double.TryParse(Txtbx_ClaimValue.Text, out d))
   {
   .. Report input problem to user do he can fix it ...
   return;
   }
if (d == 0.0)
   {
   Lbl_Message.Text = "Error. Claim Value ?";
   Txtbx_ClaimValue.Focus();
   return;
   }

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