How Can I Simplify If Statements Checking for Multiple Values in Programming?

Simplify If statements that match multiple values

In programming, if statements are often used to check specific conditions and execute the corresponding block of code. Suppose you need to determine whether a variable value is equal to 1 or 2. The traditional approach is to use nested if statements:

<code>if (value == 1) {
  // 执行的代码
}
else if (value == 2) {
  // 执行的代码
}</code>

However, this approach can become verbose when multiple values ​​need to be matched. For example, in SQL, the equivalent code would be more concise:

<code>WHERE value IN (1, 2)</code>

For basic programming types (strings, integers, etc.), you can use the following techniques:

<code>if (new[] {1, 2}.Contains(value))</code>

This method creates an array containing the expected value and uses the Contains method to check if value is present in the array.

Alternatively, you can define your own extension method:

<code>public static bool In<T>(this T obj, params T[] args)
{
    return args.Contains(obj);
}</code>

Using this approach you can simplify the if statement:

<code>if (1.In(1, 2))</code>

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