C# Convert.ToInt32() Method Explained

In C#, the Convert.ToInt32() method is used to convert a specified value to a 32-bit signed integer. It takes one parameter that can be of various types including integers, floats, booleans, characters, and more.

This method will attempt to convert the input value to a 32-bit signed integer and return the converted result. If the conversion cannot be done (for example, if the input value is empty, in the incorrect format, etc.), an exception will be thrown.

Here are some examples of using the Convert.ToInt32() method:

int num1 = Convert.ToInt32("123");  // 将字符串"123"转换为整数 123
int num2 = Convert.ToInt32(3.14);   // 将浮点数3.14转换为整数 3（小数部分被截断）
int num3 = Convert.ToInt32(true);   // 将布尔值true转换为整数 1
int num4 = Convert.ToInt32('A');    // 将字符'A'转换为整数 65（ASCII码）

It’s important to note that if the input value exceeds the range of a 32-bit signed integer (-2,147,483,648 to 2,147,483,647), an OverflowException exception will be thrown. In this case, you may consider using the Convert.ToInt64() method to convert to a 64-bit signed integer, or using the TryParse() method for conversion and checking if it was successful.