VB转成C#的。。。请问这段怎么转？

str = Text1.Text 'Str为喊话内容
i = 0
data = StrConv(str, vbfromUnicode)
While i <= UBound(data)
If data(i) < 128 Then
PostMessage hwnd, WM_CHAR, data(i), 0&
PostMessage hwnd, WM_SETFOCUS, 0, 0 '获得窗口焦点
PostMessage hwnd, WM_KEYDOWN, VK_RETURN, MapVirtualKey(VK_RETURN, WM_KEYDOWN) '发送回车键
i = i + 1
Else
PostMessage hwnd, WM_CHAR, data(i), 0&
PostMessage hwnd, WM_CHAR, data(i + 1), 0&
i = i + 2
End If
Wend

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自己转肯定要VB和C#都会用啊，，要不就找工具吧。。看有没有。

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DLLIMPORT PostMessage所在的DLL，再定义需要的常量

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C# code:
int i=0;
string talkStr = talkTBox.Text;
byte[] talkBytes = System.Text.Encoding.Unicode.GetBytes(talkStr);

while (i < talkBytes.Length)
{
if (talkBytes[i] < 128)
{
PostMessage(gameHandle, (int)WinIo.WinMsg.WM_CHAR, talkBytes[i], 0);
i++;
}
else
{
PostMessage(gameHandle, (int)WinIo.WinMsg.WM_CHAR, talkBytes[i], 0);
PostMessage(gameHandle, (int)WinIo.WinMsg.WM_CHAR, talkBytes[i+1], 0);
i = i + 2;
}
}