C# 将字符串写入Excel单元格不会'；行不通

我有一个服务器，可以通过套接字接收来自客户端的消息。
使用按钮1，我打开服务器以便接收字符串。然后是ReceiveCallback：

public void ReceiveCallback(IAsyncResult AR)
{
    try
    {
        Socket socket = (Socket)AR.AsyncState;
        int received = socket.EndReceive(AR);

        if (received == 0)
        {
            return;
        }

        byte[] dataBuf = new byte[received];
        Array.Copy(BuFfer, dataBuf, received);
        string text = Encoding.ASCII.GetString(dataBuf);
        writetotextbox("Client: " + text);
        //writetoExcel(text); <<<<<<<<<-------------
        socket.BeginReceive(BuFfer, 0, BuFfer.Length, SocketFlags.None, new AsyncCallback(ReceiveCallback), socket); //deze zorgt voor problemen
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, Application.ProductName, MessageBoxButtons.OK, MessageBoxIcon.Error);
    }
}

public void writetotextbox(string text)
{
    MethodInvoker invoker = new MethodInvoker(delegate
    {
        textBox1.Text += text + "\r\n";
    });
    this.Invoke(invoker);
}

我用按钮2打开excel工作表。excel文件在打开或关闭时收到值时是否刷新自身

try
{
    Start = new Excel.Application(); 
    theWorkbook = Start.Workbooks.Add(misValue);
    theWorkbook = Start.Workbooks.Open(@"C:\Users\Name\Downloads\Map1.xlsx", misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue, misValue);
    Excel._Worksheet oSheet =     (Excel._Worksheet)theWorkbook.Worksheets.get_Item(1);
    string strWorksheetName = oSheet.Name;
    oSheet.Cells[1, 1] = "Hello";
    oSheet.get_Range("A1", "Z1").Font.Bold = true;
    Start.Visible = true;
    Start.UserControl = true;
}
catch (Exception theException)
{
    MessageBox.Show(errorMessage, "Error");
}

public void writetoExcel(string text)
{
      oSheet.Cells[1, 2] = text; // <-- doenst work, i get an error
}                 //oSheet is not working.

在您的案例中，它有助于包括（或者更确切地说，研究）实际的编译器错误：

当前上下文中不存在名称“oSheet”

您似乎在声明

Excel.\u工作表oSheet

的方法与您要使用它的方法不同

您可以将其设置为表单上的字段，并在第一种方法中分配：

public partial class YourForm : Form
{
    private Excel._Worksheet oSheet;

    private void SomeMethod()
    {
        oSheet = (Excel._Worksheet)theWorkbook.Worksheets.get_Item(1);
    }

    public void writetoExcel(string text)
    {
      oSheet.Cells[1, 2] = text;
    }

}

switch (text)
{
    case "a":
    oSheet.Cells[1, 2] = "Kees";
    break;
    case "b":
    oSheet.Cells[2, 2] = "piet";
    break;
} //and ofcourse write the string to excel

public partial class YourForm : Form
{
    private Excel._Worksheet oSheet;

    private void SomeMethod()
    {
        oSheet = (Excel._Worksheet)theWorkbook.Worksheets.get_Item(1);
    }

    public void writetoExcel(string text)
    {
      oSheet.Cells[1, 2] = text;
    }

}