c#.net中的错误处理 [英] error handling in c#.net

问题描述

大家好...，
请帮我，
我在int数据类型中传递了null值，然后发生以下错误，这是我的代码:

hi all...,
Plz help me,
i am passing null value in int datatype then error is occured following is my code:

int FID = convert.Toint32(linkbutton.CommandArgument);

一些记录FID具有值，但是一些记录FID具有NULL.当它具有null值时，发生错误输入字符串的格式不正确"，我想处理此错误.


在此先感谢.....

some records FID have values but some records FID have NULL. when it have null value the error occured "Input string was not in correct format" i want to handle this error.


Thanks in advance.....

推荐答案

这里是Pokemon Exception Handing的试用版

Here is the try catch version of it with Pokemon Exception handing

try
{
 int FID = convert.Toint32(linkbutton.CommandArgument);
 //here the FID is a valid value so go ahead and do soemthing
}
catch(Exception ex)
{
  //darn it, invalid value found. lets think about handling it or ignoring it
}

另外，如果您不想在转换失败的情况下不处理异常，则可以改为调用Int32.TryParse方法.它返回一个布尔值，该值指示转换是成功还是失败.

also If you prefer not to handle an exception if the conversion fails, you can call the Int32.TryParse method instead. It returns a Boolean value that indicates whether the conversion succeeded or failed.

试试这个:

Hi,
Try this:

if(linkbutton.CommandArgument != null){
    int FID = convert.Toint32(linkbutton.CommandArgument);
}
else{
   int FID = 0; //Compare your data with 0 if it is required.
}

一切顺利.

All the best.

像这样尝试:

Hi,

Try like this:

if ((txtValue.Text).Trim() == "")
{
     cmd.Parameters("@FID").Value = DBNull.Value
}
else
{
    Pass the actual value;

}

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