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我正在尝试将消息传递到系统 G2,但出现错误,方法“PostMessage”没有重载需要 2 个参数。你能帮忙吗,谢谢

  private void PostMsgBtn_Click(object sender, EventArgs e)
    {
        object[] C1_ob = new object[1];
        C1_ob[0] = 1;

        axG2Gateway1.PostMessage(MsgToPost.Text , ref (C1_ob));
        
    }
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