组合框添加项目抛出异常＆＃34;特定演员表无效＆＃34;

Question

您好我有以下代码 将一些项目添加到组合框中当我在线程中执行代码时我有以下异常“特定强制转换无效”但何时在主窗体中执行此操作也不例外。 任何想法如何解决这个问题？

        Control.CheckForIllegalCrossThreadCalls = false;

        //Auto Complete
        comboBox3.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
        comboBox3.AutoCompleteSource = AutoCompleteSource.ListItems;

        //no specific formatting
        comboBox3.FormattingEnabled = true;

        Thread th1 = new Thread(() =>
            {
                try
                {
                    //# Code Start

                    //Some Text 
                    String[] TicketStatus = new string[] { "a", "b", "c", "d", "e" };

                    //Throw Exception "Specific cast is not valid"
                    comboBox3.Items.AddRange(TicketStatus);

                    //# Code End
                }
                catch (Exception c) { MessageBox.Show(c.Message); }
            });
        th1.Start();

像这样没有例外

  Control.CheckForIllegalCrossThreadCalls = false;

        //Auto Complete
        comboBox3.AutoCompleteMode = AutoCompleteMode.SuggestAppend;
        comboBox3.AutoCompleteSource = AutoCompleteSource.ListItems;

        //no specific formatting
        comboBox3.FormattingEnabled = true;


        //# Code Start

        //Some Text 
        String[] TicketStatus = new string[] { "a", "b", "c", "d", "e" };

        //Throw Exception "Specific cast is not valid"
        comboBox3.Items.AddRange(TicketStatus);

        //# Code End

Answer 1

您无法从UI线程以外的线程访问UI元素。

您必须将setter代码编组回UI线程。

使用InvokeRequired来执行此操作。