在 dataGrid（位于 Form1 中）中从 textBox（位于 Form2 中）中搜索值

Question

我想从 dGVPlan（dataGrid，位于 frPlanMain.cs）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，我不为此使用 SQL。 我尝试了几种方法来做到这一点，但它们似乎不起作用，我是 Visual Studio 和 C# 的新手。

frPlanMain.cs（Form1）的代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.OleDb;

namespace Plan_de_lucru_1._0
{
    public partial class frPlanMain : Form
    {

        public frPlanMain()
        {
            public SearchWindow frm2;

            InitializeComponent();
        }

        private void frPlanMain_Load(object sender, EventArgs e)
        {

        }

        private void GoButton_Click(object sender, EventArgs e)
        {
            string constr = "Provider = MicroSoft.Jet.OLEDB.4.0; Data Source=" + locTBox.Text + "; Extended Properties =\"Excel 8.0; HDR=Yes;\";";
            OleDbConnection con = new OleDbConnection(constr);
            OleDbDataAdapter sda = new OleDbDataAdapter("Select * From [" + shTBox.Text + "$]", con);
            DataTable dt = new DataTable();
            sda.Fill(dt);
            dGVPlan.DataSource = dt;
            new SearchWindow().Show();
            this.Show();
        }
    }
}

SearchWindow.cs（Form2）的代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Plan_de_lucru_1._0
{
    public partial class SearchWindow : Form
    {
        public frPlanMain refTofrPlanMain;

        public SearchWindow()
        {
            InitializeComponent();
        }

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

    }
}

我在另一篇文章中问过这个类似的问题，但我无法修改代码或理解它为什么不起作用：Search value in textBox so it finds it in the data located in gridView

非常感谢您的关注和提供的帮助，如果我问的太多，我很抱歉。

Answer 1

您可以将事件处理程序附加到 searhc 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;
    }

}

接下来使用以下代码代替new SearchWindow().Show();：

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，我在不知道您的名字的情况下写了这篇文章。

编辑：第二个选项基于您对搜索表单的编辑 这实际上很重要，因为它是一种有效的方法，但是您在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;
    }

}

用new SearchWindow(this).Show();代替new SearchWindow().Show();

长话短说，答案的第二部分将您的主要形式作为参数传递，以便可以对其中的数据进行更改。您保留了所有逻辑，但没有通过表单。