C＃语句文本框总和(C# Statement Textboxes Sum)

C＃语句文本框总和(C# Statement Textboxes Sum)

我想用下面的语句来总结3个文本框的值，但是我似乎无法使它工作。 3个文本框的值显示为十进制。 错误：mscorlib.dll中发生未处理的“System.FormatException”类型异常附加信息：输入字符串的格式不正确。

decimal num1, num2, num3, total; num1 = Convert.ToDecimal(SSubTotalTextBox.Text); num2 = Convert.ToDecimal(SubTotalMTextBox.Text); num3 = Convert.ToDecimal(SubTotalTextBox3.Text); total = num1 + num2 + num3; TotalAmountTextBox.Text = Convert.ToString(total);

I am trying to sum the values from 3 textboxes with the following statement, however i cant seem to get it working. The 3 textboxes have values displayed decimal. Error: An unhandled exception of type 'System.FormatException' occurred in mscorlib.dll Additional information: Input string was not in a correct format.

decimal num1, num2, num3, total; num1 = Convert.ToDecimal(SSubTotalTextBox.Text); num2 = Convert.ToDecimal(SubTotalMTextBox.Text); num3 = Convert.ToDecimal(SubTotalTextBox3.Text); total = num1 + num2 + num3; TotalAmountTextBox.Text = Convert.ToString(total);

最满意答案

问题中的细节不够，但我的直觉告诉我这是问题所在：

您在文本框中的内容像40,5 ，但计算机当前文化已将小数点分隔符设置为。（点） 。 因此，在将40,5转换为小数时会出现异常，因为它不明白，。

它可能是另一种方式，你正在写40.5，但它期望得到40.5。

编辑

我看到了关于Florian von Spiczak的评论，并且似乎字符$出现在文本框中。 如果是这样，那显然是一个问题。

尝试使用textBox.Text.Replace("$","")替换Convert.ToDecimal调用中的所有textBox.Text 。 这应该摆脱$并使其正确解析。

所以完整的代码应该是：

decimal num1, num2, num3, total; num1 = Convert.ToDecimal(SSubTotalTextBox.Text.Replace("$","")); num2 = Convert.ToDecimal(SubTotalMTextBox.Text.Replace("$","")); num3 = Convert.ToDecimal(SubTotalTextBox3.Text.Replace("$","")); total = num1 + num2 + num3; TotalAmountTextBox.Text = "$ "+ total;

此外，您应该用decimal.Parse或decimal.TryParse替换Convert.ToDecimal ，并在文本decimal.TryParse实际写入的内容上添加验证逻辑。

It not enough details in the question, but my gut feeling tells me this is the problem:

You have the content in the textbox like 40,5, but the computers current culture has the decimal seperator set to .(dot). Therefore you get an exception while converting 40,5 to a decimal, since it does not understand ,.

It could be the other way around and you are writing 40.5, but it expect to get 40.5.

EDIT

I saw the comment on Florian von Spiczak answer, and it seems that the character $ is present in the textboxes. If it is, that is obviously a problem.

Try to replace all the textBox.Text inside the Convert.ToDecimal calls with textBox.Text.Replace("$",""). That should get rid of the $ and make it parse properly.

So the complete code should then be:

decimal num1, num2, num3, total; num1 = Convert.ToDecimal(SSubTotalTextBox.Text.Replace("$","")); num2 = Convert.ToDecimal(SubTotalMTextBox.Text.Replace("$","")); num3 = Convert.ToDecimal(SubTotalTextBox3.Text.Replace("$","")); total = num1 + num2 + num3; TotalAmountTextBox.Text = "$ "+ total;

Also, you should replace Convert.ToDecimal with decimal.Parse or decimal.TryParse, and add some validation logic on what is actually written inside your textboxes.