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Optional and Named Parameters
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When designing a method s parameters, you can assign default values to some of or all the parameters . Then, code that calls these methods can optionally not specify some of the arguments, thereby accepting the default values . In addition, when you call a method, you can specify arguments by using the name of their parameters . Here is some code that demonstrates using both optional and named parameters:
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public static class Program { private static Int32 s_n = 0; private static void M(Int32 x = 9, String s = A , DateTimedt = default(DateTime), Guidguid = new Guid()) { Console.WriteLine( x={0}, s={1}, dt={2}, guid={3} , x, s, dt, guid); } public static void Main() { // 1. Same as: M(9, "A", default(DateTime), new Guid()); M(); // 2. Same as: M(8, "X", default(DateTime), new Guid()); M(8, "X"); // 3. Same as: M(5, "A", DateTime.Now, Guid.NewGuid()); M(5, guid: Guid.NewGuid(), dt: DateTime.Now);
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// 4. Same as: M(0, "1", default(DateTime), new Guid()); M(s_n++, s_n++.ToString()); // 5. Same as: String t1 = "2"; Int32 t2 = 3; // M(t2, t1, default(DateTime), new Guid()); M(s: (s_n++).ToString(), x: s_n++); } }
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When I run this program, I get the following output:
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x=9, x=8, x=5, x=0, x=3, s=A, s=X, s=A, s=1, s=2, dt=1/1/0001 dt=1/1/0001 dt=7/2/2009 dt=1/1/0001 dt=1/1/0001 12:00:00 12:00:00 10:14:25 12:00:00 12:00:00 AM, AM, PM, AM, AM, guid=00000000-0000-0000-0000-000000000000 guid=00000000-0000-0000-0000-000000000000 guid=d24a59da-6009-4aae-9295-839155811309 guid=00000000-0000-0000-0000-000000000000 guid=00000000-0000-0000-0000-000000000000
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As you can see, whenever arguments are left out at the call site, the C# compiler embeds the parameter s default value . The third and fifth calls to M use C# s named parameter feature . In the two calls, I m explicitly passing a value for x and I m indicating that I want to pass an argument for the parameters named guid and dt . When you pass arguments to a method, the compiler evaluates the arguments from left to right . In the fourth call to M, the value in s_n (0) is passed for x, then s_n is incremented, and s_n (1) is passed as a string for s and then s_n is incremented again to 2 . When you pass arguments by using named parameters, the compiler still evaluates the arguments from left to right . In the fifth call to M, the value in s_n (2) is converted to a string and saved in a temporary variable (t1) that the compiler creates . Next, s_n is incremented to 3 and this value is saved in another temporary variable (t2) created by the compiler, and then s_n is incremented again to 4 . Ultimately, M is invoked, passing it t2, t1, a default DateTime, and a new Guid .
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There are some additional rules and guidelines that you should know about when defining a method that specifies default values for some of its parameters:
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You can specify default values for the parameters of methods, constructor methods, and parameterful properties (C# indexers) . You can also specify default values for parameters that are part of a delegate definition . Then, when invoking a variable of this delegate type, you can omit the arguments and accept the default values . Parameters with default values must come after any parameters that do not have default values . That is, once you define a parameter as having a default value, then all parameters to the right of it must also have default values . For example, in the definition of my M method, I would get a compiler error if I removed the default value ("A") for s . There is one exception to this rule: a params array parameter (discussed later in this
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