疑难有关问题啊数据拷贝

疑难问题啊!数据拷贝
[DllImport("kernel32", EntryPoint = "RtlMoveMemory", ExactSpelling = true, CharSet = CharSet.Ansi, SetLastError = true)]
private static extern void CopyMemory(object Destination, object Source, long Length);


private static string aa(byte[] fbytFile)
{
  dim dbl as double
  CopyMemory(ByVal VarPtr(dbl), ByVal VarPtr(fbytFile(0)) + 90, 8)
}

这是VB6的一段代码.调用了一个API.

哪位帮下我,写成C#要怎么写啊

[解决办法]
private static string aa(byte[] fbytFile) --->VB是这样吗?
{ 
double dbl ;
CopyMemory(object VarPtr(dbl), object (VarPtr(fbytFile(0)) + 90), 8) ;
} 
private static void CopyMemory(object Destination, object Source, long Length); 


[解决办法]
参考如下代码

C# code

[DllImport("kernel32", EntryPoint = "RtlMoveMemory")]private static extern void CopyMemory(    IntPtr destination, IntPtr source, int length); private static string aa(byte[] fbytFile) {     double[] dbl = new double[1];    CopyMemory(Marshal.UnsafeAddrOfPinnedArrayElement(dbl, 0),         Marshal.UnsafeAddrOfPinnedArrayElement(fbytFile, 0),         Marshal.SizeOf(typeof(double)));    return dbl[0].ToString();} private void button1_Click(object sender, EventArgs e){    double[] d = new double[] { 20071009 };    byte[] b = new byte[8];    Buffer.BlockCopy(d, 0, b, 0, 8);    Text = aa(b);}