泛型约束问题
/// <summary>
/// 累加数组中所有数字
/// </summary>
/// <typeparam name="T">所有数字类型</typeparam>
/// <param name="a">数组</param>
/// <returns>数字</returns>
public static double Sum<T>(T[] a) where T : sbyte, byte, short, ushort, int, uint, long, ulong, float, double {
double s = 0;
for (int i = 0; i < a.Length; i++) {
s += Double.Parse( a[i].ToString());
}
return s;
}
错误 “sbyte”不是有效的约束。作为约束使用的类型必须是接口、非密封类或类型形参。
我想对这个约束为数字怎么写？
[解决办法]
约束不能指定为int、double这种，按你的需求，只能写成
public static double Sum<T>(T[] a) where T : struct
[解决办法]
public static double Sum<T>(T[] a) where T : struct
{
double s = 0;
for (int i = 0; i < a.Length; i++)
{
ValueType value = a[i] as ValueType;
if (value != null && (value is Byte
[解决办法]
value is Int16
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value is Int32
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value is Int64
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value is SByte
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value is UInt16
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value is UInt32
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value is UInt64
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value is Decimal
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value is Double
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value is Single))
{
s += Double.Parse(a[i].ToString());
}
}
return s;
}
[解决办法]
