C# 从dataGrid（位于表单1）中的文本框（位于表单2中）搜索值

我想从dGVPlan（dataGrid，位于frPlanMain.cs中）中的searchTBoxW（SearchWindow.cs）中搜索一个值。 frPlanMain.cs中的dataGrid通过在locTBox中输入文件的路径来加载.xls文件，我不使用SQL。 我尝试了几种方法来实现这一点，但它们似乎不起作用，我对VisualStudio和C#还不熟悉

frPlanMain.cs的代码（格式1）：

SearchWindow.cs的代码（格式2）：

我曾在另一篇帖子中问过类似的问题，但我无法修改代码，也无法理解为什么代码不起作用：

---

非常感谢您的关注和帮助，如果我要求太多，我很抱歉。

您可以将事件处理程序附加到Search表单：

public partial class SearchWindow : Form
{
    public String SearchKey{
       get{return searchKey_textbox.Text}
    }
    public SearchWindow()
    {
        InitializeComponent();
    }

    private void SearchButtonW_Click(object sender, EventArgs e)
    {

    }

    public void searchBtn_attachClickHandler(EventHandler eh){
         searchBtn.Click += eh;
    }

}

下一步而不是

newsearchwindow（）.Show（）使用以下代码：

String searchKey = "";  //This variable could be global (just so you could use the next few lines almost anywhere
SearchWindow sw = new SearchWindow(); //create a form and attach a handler that will be triggered when "search" button in search form is clicked
//Note that you only need to attach the handler (below) only when you create the form.
sw.searchBtn_attachClickHandler += delegate(object sender, EventArgs e) {
searchKey = sw.SearchKey;
sw.close //will close after getting the search key, remove this line if you don't want it
};
sw.Show(); //finally shows the form
//at this point your searchKey form should already have the value from your search form.

请注意，您可能需要重命名一些变量，我写这篇文章时不知道您的名字

编辑：基于您对搜索表单的编辑的第二个选项
这实际上很重要，因为这是一个有效的方法，但构造函数中缺少一个参数

public partial class SearchWindow : Form
{
    public frPlanMain refTofrPlanMain;

    public SearchWindow(frPlanMain f) //<<Edit made here 
    {
        refTofrPlanMain = f;
        InitializeComponent();
    }

    private void SearchButtonW_Click(object sender, EventArgs e)
    {
    BindingSource bs = new BindingSource();
    bs.DataSource = refTofrPlanMain.dGVPlan.DataSource;
    bs.Filter = "[column name] like '%" + searchTBoxW.Text + "%'";
    refTofrPlanMain.dGVPlan.DataSource = bs;
    }

}

公共部分类搜索窗口：表单
{
公共frPlanMain refTofrPlanMain；
public SearchWindow（frPlanMain f）//您的搜索窗口根本不起任何作用。您在该窗口中键入的搜索键是结果窗口还是结果窗口？是的，它缺少代码，我尝试了几个示例，即使我正确引用了所需的项，它们也会抛出错误。我正在尝试在SearchBox（文本框）中输入值然后通过按SearchButtonW在我的DataGridView中搜索它。我用我使用的命令更新了Form2，得到了一个未处理的异常，类型为“System.NullReferenceException”。我收到以下错误：附加信息：语法错误：在“Like”运算符之前缺少操作数。是因为我没有引用某个colu吗mn？我相信bs.Filter=“比如“%”+searchTBoxW.Text+“%”中缺少某些内容；在like之前。哦，对了，你应该指定列和字符串的那部分。没有检查代码。问题是我从某个路径导入了一个.xls，并且没有预先确定的列。或者是否可以创建一个列并告诉GridView从.xls文件中显示哪些列？你可以在MS网站上创建DataGridView读取列名（从xls的第一行）手动。答案非常简单，从.xls文件的第一行中的名称创建列，然后添加所有行。谢谢。几乎可以了，但仍然需要解决如何定义从何处获取文本的列，但它解决了如何分配列的问题。如果有与此相关的问题，我可以与您联系吗？
String searchKey = "";  //This variable could be global (just so you could use the next few lines almost anywhere
SearchWindow sw = new SearchWindow(); //create a form and attach a handler that will be triggered when "search" button in search form is clicked
//Note that you only need to attach the handler (below) only when you create the form.
sw.searchBtn_attachClickHandler += delegate(object sender, EventArgs e) {
searchKey = sw.SearchKey;
sw.close //will close after getting the search key, remove this line if you don't want it
};
sw.Show(); //finally shows the form
//at this point your searchKey form should already have the value from your search form.

public partial class SearchWindow : Form
{
    public frPlanMain refTofrPlanMain;

    public SearchWindow(frPlanMain f) //<<Edit made here 
    {
        refTofrPlanMain = f;
        InitializeComponent();
    }

    private void SearchButtonW_Click(object sender, EventArgs e)
    {
    BindingSource bs = new BindingSource();
    bs.DataSource = refTofrPlanMain.dGVPlan.DataSource;
    bs.Filter = "[column name] like '%" + searchTBoxW.Text + "%'";
    refTofrPlanMain.dGVPlan.DataSource = bs;
    }

}