dotnet core 用值初始化整个数组

var prime = new bool[1000];
for ( int i = 0; i < prime.Length; i++ )
{
   prime[i] = true;
}

var prime = Enumerable.Repeat(true, 1000).ToArray();

var data = new bool[1000];
Array.Fill(data, true);

public static void Fill<T>(T[] array, T value)
{
    if (array == null)
    {
        ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array);
    }

    for (int i = 0; i < array.Length; i++)
    {
        array[i] = value;
    }
}