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

我正在尝试使用C#中的convert函数将String值转换为Int值.有人可以在这方面帮助我吗?

字符串A = dt.Rows [0] ["Quno"].ToString();
Int B = Int32.Parse(A);

I am trying to convert a String value to a Int value using convert function in C#. Can anybody help me in this regards...

String A = dt.Rows[0]["Quno"].ToString();
Int B =Int32.Parse (A);

推荐答案

如果dt.Rows [0] ["Quno"].ToString();请使用以下命令包含null值，那么它将自动处理并且不会给出错误

Hi,
Please use following, if dt.Rows[0]["Quno"].ToString(); contain null value then it will automatically handle and it will not gives error

if(dt != null && dt.Rows.Count > 0)
        {
        Int32 B = Convert.ToInt32(dt.Rows[0]["Quno"].ToString());
        }

如有任何疑问，请让我知道.

如果有帮助，请提供"投票"，如果这是正确的答案，请提供"接受答案".:rose:

谢谢，
Imdadhusen

Please do let me know, if you have any doubt.

Please provide "Vote" if this would be helpful, and make "Accept Answer" if this would be correct answer.:rose:

Thanks,
Imdadhusen

这是因为字符串为空或包含对数字无效的字符

我建议使用TryParse

This is because the string is blank or contains characters not valid for a number

I would recommend using TryParse

int iVal;
if (int.TryParse(myString, out iVal))
   // this worked
else
   // this failed

使用int.TryParse而不是Int32.Parse.确认您输入的是有效字符串.

Use int.TryParse rather than Int32.Parse. Confirm you are entering a valid string.

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