C# Equality Comparisons: When Should I Use `==` vs. `Equals()`?

C# object comparison: understand the difference between equal operators and equals () methods

In C#, equal comparison is the key part of programming. Two methods of equal commonly used objects are equal computing symbols (== and! =) And Equals () methods. However, understanding the subtle differences of these two methods is essential for avoiding accidents.

equal computing symbols (== and! =)

equal computing (== and! =) The execution value type is equal to comparison. For reference types (such as string, objects, etc.), they are compared with object references, not the actual content of the object. This means that if the two reference variables point to the same object instance, == will return True,! = Will return false.

In your example, you are comparing the two string objects:

Because the string object is immutable, they are regarded as a value type by default. Therefore, == The comparison of the operator is the value of the string, which is not equal in this example. Therefore, the conditions will be evaluated as false.

<code class="language-csharp">if (((ListBoxItem)lstBaseMenu.SelectedItem).Content == "Energy Attack")
{
    // 执行代码
}</code>

Equals () Method

The

Equals () method is a virtual method. It is defined in the System.Object class and is rewritten by various types to provide a specific type of comparison. Unlike equal operators, the Equals () method compares the actual content of the object, regardless of their citations. For string, the Equals () method compares the character sequence of the string. Because your situation involves comparing the two character string words, the Equals () method returns true because the character sequence is the same.

Summary

<code class="language-csharp">if (((ListBoxItem)lstBaseMenu.SelectedItem).Content.Equals("Energy Attack"))
{
    // 执行代码
}</code>

The choice of using equal operators and equals () methods depends on specific scenes and required behaviors. Generally speaking, == The computing symbol should be used for equal comparison, and the Equals () method should be used to reference type equal comparison. In this case, you need the actual content of the object.

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