C# TextChanged 未触发(非 ASP.net)桌面应用程序

C# TextChanged not firing off (non ASP.net) Desktop application

我是 C# 的新手,一直在尝试学习如何使用文本更改,以便用户不必手动点击按钮。但是我可以让我的应用程序使用 textChanged 事件。我已经创建了一个测试程序来查看它是否有效,是的,它确实有效。这是我需要帮助的非工作代码,如果您需要更多,请告诉我。

形式代码:

private void custFNameTxt_TextChanged(object sender, EventArgs e)
    {
        searchFirstName(custFNameTxt, customers);//search first name make searched list
        Console.Write("working!!!!!!!!!!!!!!!!!!!!!!!"); // for testing
    }

代码是在我添加事件时添加到设计器中的:

// 
        // custFNameTxt
        // 
        this.custFNameTxt.Location = new System.Drawing.Point(98, 45);
        this.custFNameTxt.MaxLength = 12;
        this.custFNameTxt.Name = "custFNameTxt";
        this.custFNameTxt.Size = new System.Drawing.Size(171, 20);
        this.custFNameTxt.TabIndex = 1;
        this.custFNameTxt.TextChanged += new System.EventHandler(this.custFNameTxt_TextChanged);

我已经尝试将处理程序添加到加载表单(这没有让它工作):

private void Form1_Load(object sender, EventArgs e)//when form loads do this
    {
        //set unsername field to be selected on load
        usernameTxt.Focus();
        custFNameTxt.TextChanged += new EventHandler(custFNameTxt_TextChanged);
    }

这是它调用的方法,以防问题出在它而不是事件调用上:

private void searchFirstName<T>(Control textBox, List<T> list)//method to search customers by first name
    {
        if (list.GetType() == typeof(List<Customer>))
        {
            searchForThis = (textBox as TextBox).Text.ToUpper().Trim().ToString();
            for (int i = 0; i < customers.Count -1; i++)
            {
                searchThis = customers[i].F_name.ToUpper();

                if(searchThis.Substring(0, searchForThis.Length) == searchForThis)
                {
                    searched.Add(customers[i]);
                }
            }//end for loop
        }//end if type of customer

我寻求帮助的速度太快了,看来我的按钮推送中还有一堆其他需要的代码,文本中需要这些代码才能正常工作。谢谢大家的帮助,在我得到一些建议之前,我只是想不出问题是什么。

if (!string.IsNullOrEmpty(custFNameTxt.Text) && string.IsNullOrEmpty(custIdTxt.Text) ||
            !string.IsNullOrEmpty(custLNameTxt.Text) && !string.IsNullOrEmpty(custFNameTxt.Text) ||
            string.IsNullOrEmpty(custLNameTxt.Text) && !string.IsNullOrEmpty(custFNameTxt.Text)) 
        {
            searchFirstName(custFNameTxt, customers);//search first name make searched list
            custSearchList.Clear();
            foreach (Customer custs in searched)
            {
                altRowColor(searched, custSearchList);//iterate throught list alt row color
            }
            altCust = 0;//reset altCust to avoid errors
            if (!string.IsNullOrEmpty(custFNameTxt.Text) && !string.IsNullOrEmpty(custLNameTxt.Text))//Narrow down the search
            {
                narrowByLast();//narrow method
                custSearchList.Clear();//clear text
                foreach (Customer custs in searched)
                {
                    altRowColor(searched, custSearchList);//iterate throught list alt row color
                }
                altCust = 0;//reset altCust to avoid errors
            }
        }