How to show method parameter tooltip in C#?

How to show method parameter tooltip in C#?

To show the method parameter tooltip in C# in Visual Studio, you can use the IntelliSense feature.

IntelliSense displays a tooltip that shows the name, data type, and description of each parameter as you type. This tooltip also shows the default value for optional parameters.

To use IntelliSense:

  1. Start typing the method name in your code.
  2. Once the method name appears, type an open parenthesis ( to display the method signature.
  3. If the method has parameters, a tooltip will appear showing the name, data type, and description of the first parameter.
  4. Continue typing the parameter value, or use the arrow keys to move to the next parameter.
  5. To see the tooltip for another parameter, use the arrow keys to move to that parameter.

Here's an example:

 public void DoSomething(string param1, int param2, bool param3 = false) { // Do something with the parameters } // ... // Type the method name and an open parenthesis to see the parameter tooltip DoSomething( // Type the first parameter value and a comma to move to the next parameter and see its tooltip "hello", // Type the second parameter value and a comma to move to the next parameter and see its tooltip 42, // The third parameter has a default value, so you don't need to provide a value for it )

In this example, we define a method called DoSomething with three parameters: param1 of type string, param2 of type int, and param3 of type bool, which has a default value of false.

To use IntelliSense, we start typing the method name in our code and an open parenthesis ( to display the method signature. The tooltip for the first parameter appears, showing its name, data type, and description.

We then type the first parameter value "hello" and a comma , to move to the next parameter and see its tooltip. We continue typing the second parameter value 42 and a comma , to move to the next parameter and see that it has a default value.

We then close the parenthesis ) to complete the method call.

Examples

  1. "C# show method parameter tooltip"

    • Code:
      /// <summary> /// This is a sample method. /// </summary> /// <param name="param1">First parameter description.</param> /// <param name="param2">Second parameter description.</param> public void SampleMethod(int param1, string param2) { // Method implementation }
    • Description: Adding XML comments with <param> tags provides descriptions for method parameters, which can be displayed as tooltips in IDEs.

  2. "C# show tooltip for generic method parameters"

    • Code:
      /// <summary> /// Generic method example. /// </summary> /// <typeparam name="T">Type parameter description.</typeparam> /// <param name="value">Value parameter description.</param> public void GenericMethod<T>(T value) { // Method implementation }
    • Description: Generic method parameters can also have tooltips by using <typeparam> tags in XML comments.

  3. "C# tooltip for extension method parameters"

    • Code:
      /// <summary> /// Extension method example. /// </summary> /// <param name="str">String parameter description.</param> public static void MyExtensionMethod(this string str) { // Method implementation }
    • Description: Extension methods also support tooltips for parameters by using XML comments.

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