An anonymous method is a method without a name.
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Anonymous methods in C# can be defined using the delegate keyword and can be assigned to a variable of delegate type.
public delegate void Print(int value);
static void Main(string[] args)
{
Print print = delegate(int val)
{
Console.WriteLine("Inside Anonymous method. Value: {0}", val);
};
print(100);
}
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Anonymous methods can access variables defined in an outer function.
Example: Anonymous Method
public delegate void Print(int value);
static void Main(string[] args)
{
int i = 10;
Print prnt = delegate(int val)
{
val += i;
Console.WriteLine("Anonymous method: {0}", val);
};
prnt(100);
}
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Anonymous methods can also be passed to a method that accepts the delegate as a parameter.
In the following example, PrintHelperMethod() takes the first parameters of the Print delegate:
Example: Anonymous Method as Parameter
public delegate void Print(int value);
class Program
{
public static void PrintHelperMethod(Print printDel,int val)
{
val += 10;
printDel(val);
}
static void Main(string[] args)
{
PrintHelperMethod(delegate(int val) { Console.WriteLine("Anonymous method: {0}", val); }, 100);
}
}
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Anonymous methods can be used as event handlers:
Example: Anonymous Method as Event Handler
saveButton.Click += delegate(Object o, EventArgs e)
{
System.Windows.Forms.MessageBox.Show("Save Successfully!");
};
