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1、使用参数数组
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static int SumVals(params int[] vals)
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{
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int sum=0;
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foreach (int val in vals)
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{
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sum +=val;
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}
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return sum;
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}
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static void Main(string[] args)
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{
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int sum=SumVals(1,5,2,9,8);
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Console.WriteLine("Summed Values={0}",sum);
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Console.Readkey();
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}
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2、引用参数和值参数
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static int Double(ref int val)
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{
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val *=2;
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return val;
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}
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int val=0;
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int DoubleVal=Double(ref val);
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使用ref参数的变量有两个限制:
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1、不能是常量 const int val;
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2、必须使用初始化过的变量 int val;
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输出参数out与ref的区别
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1、未赋值的变量作为ref的参数是非法的,但可作为out的参数
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2、使用out参数时,该参数必须在函数中赋值,调用代码的变量值会更新;
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int[] myArray={1,8,3,6,2,5,9,3,0,2};
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int maxIndex;
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Console.WriteLine(MaxValue(myArray,out maxIndex));
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Console.WriteLine(maxIndex);
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Console.ReadKey();
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private static int MaxValue(int[] intArray, out int maxIndex)
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{
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int maxVal = intArray[0];
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maxIndex = 0;
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for (int i = 1; i < intArray.Length; i++)
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{
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if (intArray[i] > maxVal)
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{
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maxVal = intArray[i];
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maxIndex = i + 1;
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}
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}
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return maxVal;
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}
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