


How to Fix the 'Input String Was Not in a Correct Format' Error in a C# Calculator?
Jan 30, 2025 am 01:51 AM
In C#, trying to analyze the invalid string to numerical data type may cause the "input string format to incorrect" error. This error occurs when the string passed to the method does not meet the expected format of the target data type.
In a given C#calculator code, the error occurred because the Parse
method is used in the constructor to convert the empty string (retrieved from the text box) to an integer. By default, the text box is empty when creating a window.
Solution: Parse
In order to solve this problem, the code should update the values ??of and in the button click on the event, rather than in the constructor, because the text box contains meaningful values ??in the button click event. In addition, the method should be used to process the string may not contain an effective integer.
It will not throw an exception to make it easier to deal with.
a
The following is the modified code fragment: b
TryParse
TryParse
This modification will change and
and
, which is more in line with the code style of modern C#, and clearly specifies the type of output parameters. More importantly, it adds a placeholder// ... (不變的代碼) public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { if (Int32.TryParse(textBox1.Text, out int a)) { // 執(zhí)行加法運算 } else { // 處理無效輸入,例如顯示錯誤消息 } if (Int32.TryParse(textBox2.Text, out int b)) { // 執(zhí)行加法運算 } else { // 處理無效輸入,例如顯示錯誤消息 } add(); result(); } // ... (其余代碼不變)when fails. It is recommended to add code here to process invalid input. For example, display a messagebox informing the user informing the error, or resetting the text box content to empty Essence This makes the program more robust and can better process the error data that users may enter.
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