C＃ASP.NET中的输入字符串格式不正确 [英] Input string was not in correct format in C# ASP.NET

问题描述

protected void Page_Load(object sender, EventArgs e)
    {
        string score = Request.QueryString["Score"];
        Label1.Text = score;
        int value = Convert.ToInt32(score);
        if (value >= 10)
        {
            Label2.Text = "Cheers ! your score is satisfactory to promote you for the next level. All the best for the Next Move.";
        }
        else
        {
            Label2.Text = "Sorry ! Your score is not satisfactory to promote you for the next level. You can again attempt this level after Seven Days.";
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        int level = Convert.ToInt32(Request.QueryString["level"]);
        Response.Redirect("Toplist.aspx?level=" + level);
    }
}

我的尝试：



int value = Convert.ToInt32（得分）;在这行错误（输入字符串格式不正确）

What I have tried:

int value = Convert.ToInt32(score); in this line error(Input string was not in correct format)

推荐答案

嗯，你期待什么？查看得分的值。试想一下：

Well, what did you expect? Look at the value of score. Just imagine:

string score = "Blah!";
int value = Convert.ToInt32(score);

应该引起异常。

其他问题可能是由本地化引起的。一千可写为 1,000 或 1.000 或 1 000 或 1000 或...

正如 Bernhard Hiller 已经指出的那样，尝试将字符串转换为一个数字可以提出一个斧头。因此（健壮的）代码应该处理这种情况。将字符串转换为整数时，您基本上有两个选项：

As already noted by Bernhard Hiller trying to convert a string to a number can raise an axception. Hence (robust) code should handle such a case. When converting a string to an integer you have basically two options:

1. 处理异常（您可以在文档中找到代码示例：Convert.ToInt32 Method（String）（System） [ ^ ]）。
2. 使用Int32.TryParse方法（文档 Int32.TryParse方法（String，Int32）（系统） [ ^ ]也提供了代码示例。

1. Handle the exception (you may find code sample inside the very documentation: Convert.ToInt32 Method (String) (System)[^]).
2. Use the Int32.TryParse method (the documentation Int32.TryParse Method (String, Int32) (System)[^] provides a code sample as well).

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