I don't understand the usefulness of parameter arrays?

Parameter arrays allow a variable number of arguments to be passed into a method:

    static void Method(params int[] array)
    {}

But I fail to see their usefulness, since same result could be achieved by specifying a parameter of particular array type:开发者_运维百科

    static void Method(int[] array)
    {}

So what benefits ( if any ) does parameter array have over value parameter of array type?

thank you

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It's just a code readability thing. For example, string.Format:

string value = string.Format("SomeFormatString", param1, param2, param3, param4.... param999);

It could be written like this in a different lifetime:

string value = string.Format("SomeFormatString", new string[] { param1, param2, param3 });

In the end, it's just syntactic sugar to make the code easier to read and easier to understand.

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In the second example, the consumer can't call it using

MyType.Method(1, 2, 3)

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The benefit is that the compiler creates the array automatically for you:

string coor = String.Concat("x=", x, ", y=", y);

The code that is generated for you is actually:

string coor = String.Concat(new string [] { "x=", x, ", y=", y });

You even get the best of both worlds. If you happen to have your data in an array, you can pass it to a method that has a params parameter.

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I for one much prefer to write

Method(1, 2, 3, 4, 5);

instead of

Method(new int[] { 1, 2, 3, 4, 5} );

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It's how they're called.

In the first example, with params, you can call Method(1,2,3,4,5);

In the second example, without params, you have to call it Method(new [] {1,2,3,4,5});