C# 如何解决“输入字符串的格式不正确”。错误？
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How to resolve "Input string was not in a correct format." error?
提问by Md. Arafat Al Mahmud
What I tried:
我试过的：
MarkUP:
标记：
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
<asp:Label ID="Label1" runat="server" AssociatedControlID="TextBox2" Text="Label"></asp:Label>
<asp:SliderExtender ID="SliderExtender1" TargetControlID="TextBox2" BoundControlID="Label1" Maximum="200" Minimum="100" runat="server">
</asp:SliderExtender>
Code Behind:
背后的代码：
protected void setImageWidth()
{
int imageWidth;
if (Label1.Text != null)
{
imageWidth = 1 * Convert.ToInt32(Label1.Text);
Image1.Width = imageWidth;
}
}
After running the page on a browser, I get the System.FormatException: Input string was not in a correct format.
在浏览器上运行页面后，我得到System.FormatException：输入字符串的格式不正确。
采纳答案by Deval Ringwala
Problem is with line
问题是线路
imageWidth = 1 * Convert.ToInt32(Label1.Text);
Label1.Textmay or may not be int. Check http://msdn.microsoft.com/en-us/library/sf1aw27b.aspxfor exceptions.
Label1.Text可能是也可能不是 int。检查http://msdn.microsoft.com/en-us/library/sf1aw27b.aspx是否有异常。
Use Int32.TryParse(value, out number)instead. That will solve your problem.
使用Int32.TryParse(value, out number)来代替。那将解决您的问题。
int imageWidth;
if(Int32.TryParse(Label1.Text, out imageWidth))
{
Image1.Width= imageWidth;
}
回答by Habib
Because Label1.Textis holding Labelwhich can't be parsed into integer, you need to convert the associated textbox's text to integer
因为Label1.Text是hold Label，不能解析成整数，所以需要将关联的文本框的文本转换成整数
imageWidth = 1 * Convert.ToInt32(TextBox2.Text);
回答by David W
If using TextBox2.Textas the source for a numeric value, it must first be checked to see if a value exists, and then converted to integer.
如果TextBox2.Text用作数字值的来源，则必须先检查它是否存在值，然后再转换为整数。
If the text box is blank when Convert.ToInt32is called, you will receive the System.FormatException. Suggest trying:
如果Convert.ToInt32调用时文本框为空白，您将收到System.FormatException. 建议尝试：
protected void SetImageWidth()
{
try{
Image1.Width = Convert.ToInt32(TextBox1.Text);
}
catch(System.FormatException)
{
Image1.Width = 100; // or other default value as appropriate in context.
}
}
回答by Aghilas Yakoub
Replace with
用。。。来代替
imageWidth = 1 * Convert.ToInt32(Label1.Text);
