加到整数字符串C# [英] add to integers String C#

问题描述

lblUnit.Text = (Int32.Parse(Session["Price"].ToString()) + Int32.Parse(Session["EfPrice"].ToString())).ToString();

这给出了错误:输入字符串的格式不正确"

This gives the error: "Input string was not in correct format"

Thanks for your time!

推荐答案

检查您在会话中输入了哪些值-其中一个("Price"或"EfPrice")不是数字值，或者包含无效字符.

Check what values you have put into the Session - one of them (either "Price" or "EfPrice") is not numeric, or contains invalid characters.

lblUnit.Text = (Int32.Parse(Session["Price"].ToString()) + Int32.Parse(Session["EfPrice"].ToString())).ToString();
// ------------------------------------------^                                            ^
// ---------------------------------------------------------------------------------------|

首先存储在Session变量中的是什么?如果Session变量的内容已经是一个字符串，则调用ToString()是多余的.如果已经是一个int转换将使用更少.如果是这样，则EfPrice或/和Price已经包含int，您可以将它们加起来.我认为尽管从错误消息中可以看到，其中一个变量包含一个浮点数或一个双精度值(也许也包含两者).将double转换为字符串可以很容易地对该字符串进行int转换.

如果您要在此处处理浮点数/双精度数，请使用正确的方法进行如下所示的转换:

What is it that was stored in the Session variable in the first place? If the content of the Session variable is already a string calling ToString() is superflous. If it was already an int the conversion would be use less. If it were so that EfPrice or/and Price already contained ints you could just sum them up. I think though from the error message you are receiving that one of the variables contains a float or a double value (maybe also both). A double converted to a string can make an int conversion on that string fail quite easily.

If you''re dealing with floats/doubles here use the correct methods to do the conversions like here:http://social.msdn.microsoft.com/Forums/is/csharpgeneral/thread/3161a030-4136-4f43-a811-083ef87cd189[^].

Regards,

—MRB

，如果一个会话变量或两个变量都包含字母或特殊字符.
在这种情况下，只有您会得到例外

if once of your session variable or both of the variables contains alphabets or special characters .
in this case only you will get the exception

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