When using C# for WinForm development, you often need to obtain user input data from WinForm forms. If it is a string, it is easy to do, just use "control name.Text". But what if it is a value of a numeric type? How to get it? How to judge? How to convert? What is the error message? Let’s see below.
If I want to get a user input number from the WinForm interface, the code is as follows:
Copy the codeThe code is as follows:
int num; //Define a variable of type int to receive values
//Suppose that the text box control name that receives user input is "txtNum", which is of string type.
//Use methods to judge. If the user inputs a value of type int, the string will be converted to type int and stored in the num variable.
//If the user inputs not an int number, jump to the else part for processing
if(((), out num)
{
//After receiving the number, perform normal processing
}
else{
//It is judged that the user input is not a number
("Sorry, you entered a number"); // An error message pops up
(); //Locate the input focus of WinForm
return; //End the current handler
}
Because it emphasizes standardized operations, it is essential to put the Trim() method after the input string! Because user input may inadvertently include spaces, TABs, etc.
Until now, the judgment process of entering a value of a numeric type by the user can be perfectly concluded. Of course, if there are other judgment conditions, the num variable can be further processed. The editor will share so much in this article, I hope it will be helpful to everyone.