Question

命名空间与该类都相同。我需要在WhatsAppSend类中调用xyz（）方法。

这是我在Form1.cs中的方法

public void SendWhatsAppMsg()
{
try
{
 WhatsAppSend ws;
 ws = new WhatsAppSend(this); //Error Coming on this
ws.xyz(txtNickName.Text.ToString(),
       gridSender.Rows[iCurrentChannelNo].Cells[0].Value.ToString(),
       gridSender.Rows[iCurrentChannelNo].Cells[1].Value.ToString(),
       CreateArrayFrom(i + 1, (i + 1) + iMsgLimitPerNo),
       dropWhatsappType.SelectedItem.ToString(), 
       SendingData(dropWhatsappType.SelectedItem.ToString()), 
       ext);
}
catch(Exception e)
{
txt.log += e.ToString();
}
}

我试图在另一个类WhatsAppSend.cs中调用的方法

namespace WhatsApp_Bulk
{
    public class WhatsAppSend 
    {
        public static WhatsAppBulk form1;
        public WhatsAppSend(WhatsAppBulk _form1)
          {
              form1 = _form1;
          }
    public static String line = "";
    public static String command = "";
    public static string[] dst;
    public static int count_sleep = Convert.ToInt32(form1.txtMsgGap.Text);
    public static string WhatsAppType = "";
    public static string DataToSend = "";
    public static string ext = "";
 public void xyz(string nickname, string sender, string password, string[] Datadst, string DataWhatsAppType, string DataDataToSend, string Dataext)
        {
            dst = Datadst;
            WhatsAppType = DataWhatsAppType;
            DataToSend = DataDataToSend;
            ext = Dataext;
            WhatsApp wa = new WhatsApp(sender, password, nickname, true);
         }
     }
}

错误：

System.TypeInitializationException: The type initializer for 'WhatsApp_Bulk.WhatsAppSend' threw an exception. ---> System.NullReferenceException: Object reference not set to an instance of an object.
   at WhatsApp_Bulk.WhatsAppSend..cctor() in d:\WhatsApp Bulk\WhatsApp Bulk\WhatsAppSend.cs:line 32
   --- End of inner exception stack trace ---
   at WhatsApp_Bulk.WhatsAppSend..ctor(WhatsAppBulk _form1)
   at WhatsApp_Bulk.WhatsAppBulk.SendWhatsAppMsg() in d:\WhatsApp Bulk\WhatsApp Bulk\Form1.cs:line 367

请告诉我哪里出错了

Answer 1

public static int count_sleep = Convert.ToInt32(form1.txtMsgGap.Text);

当form1为null时，此行在类型初始化时执行。在实例构造函数中设置form1，稍后执行。

这是TypeInitializationException的常见原因。

<强> UPD：

我可以建议以下

public class WhatsAppSend
{
    public WhatsAppBulk form1;
    public WhatsAppSend(WhatsAppBulk _form1)
    {
        form1 = _form1;
        count_sleep = Convert.ToInt32(form1.txtMsgGap.Text);
    }
    public String line = "";
    public String command = "";
    public string[] dst;
    public int count_sleep;
    public string WhatsAppType = "";
    public string DataToSend = "";
    public string ext = "";
    public void xyz(string nickname, string sender, string password, string[] Datadst, string DataWhatsAppType, string DataDataToSend, string Dataext)
    {
        dst = Datadst;
        WhatsAppType = DataWhatsAppType;
        DataToSend = DataDataToSend;
        ext = Dataext;
        WhatsApp wa = new WhatsApp(sender, password, nickname, true);
    }
}

请注意，公共实例字段仍然是糟糕的设计，但我不知道您将在哪个上下文中使用此类，所以我将它们公之于众。

Answer 2

Make WhatsAppSend Class Static one然后调用，根据我的假设，在该类中声明的变量是静态的，因此该类应具有相同的Access Modifier。

无法调用类的方法

2 个答案: