C# Caller Info Attributes

by Online Tutorials Library July 22, 2022

C# Caller Info Attributes

C# provides caller info attributes to get information about the caller method. By using Caller Info attributes, we can get following information.

Location of source file
Line number at which method is called
Caller method name

This information is helpful for tracing and debugging of the source code.

To implement this feature, we need to use System.Runtime.CompilerService namespace in our application. This namespace contains the following caller info attributes.

Type	Attribute	Description
String	CallerFilePathAttribute	It is used to get full path of the source file that contains the caller.
Integer	CallerLineNumberAttribute	It is used to get line number in the source file at which the method is called.
String	CallerMemberNameAttribute	It is used to get caller method name.

A method which we want to call must use optional parameters. These optional parameters are set to default value. C# compiler set caller info to these parameters during execution of the method.

Let’s see an example.

C# Caller Method Info Example

 using System; using System.Runtime.CompilerServices; namespace CSharpFeatures {     class CallerInfoExample     {          static void Main(string[] args)         {             // Calling method             show();         }         // We must specify optional parameters to get caller info.         static void show([CallerMemberName] string callerName = null,             [CallerFilePath] string callerFilePath = null,              [CallerLineNumber] int callerLine = -1)         {             Console.WriteLine(“Caller method Name: {0}”, callerName);             Console.WriteLine(“Caller method File location: {0}”, callerFilePath);             Console.WriteLine(“Caller method Line number: {0}”, callerLine);         }     } } 

Output

Caller method Name: Main Caller method File location: f:C#C# FeaturesCSharpFeaturesCallerInfoExample.cs Caller method Line number: 10

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