编写winform 自定义控件，控件具备输入搜索条件的功能同时具备显示搜索结果的功能，显示用的是DataGridView控件，搜索用的TextBox位于DataGridView控件的第一行中，收缩条件与DatagridView的列绑定

首先，创建一个新的WinForm控件库项目，命名为MySearchControl。

然后，在Visual Studio的工具箱中，右键单击并选择“添加项目”>“新建项”，创建一个DataGridView控件，命名为MyDataGridView。

在MyDataGridView中，添加一个TextBox控件作为搜索条件的输入框，将其放置在DataGridView的第一行中。同时，将其绑定到DataGridView的一个列上，以便在搜索时进行筛选。

接下来，在MySearchControl中创建一个UserControl控件，命名为MySearchControl，该控件包含MyDataGridView和一个搜索按钮。

在MySearchControl中，我们需要在构造函数中初始化DataGridView控件，并将其添加到UserControl中。同时，我们还需要为搜索按钮添加一个Click事件处理程序，该处理程序将使用搜索条件从DataGridView中筛选结果。

最后，将MySearchControl控件添加到WinForm中并测试它是否正常工作。

以下是代码示例：

MyDataGridView.cs:

using System.Windows.Forms;

namespace MySearchControl
{
    public partial class MyDataGridView : DataGridView
    {
        public MyDataGridView()
        {
            InitializeComponent();
            this.AllowUserToAddRows = false;
            this.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
            this.RowHeadersVisible = false;
            this.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
            this.MultiSelect = false;
            this.AllowUserToResizeRows = false;
            this.AllowUserToResizeColumns = false;
            this.EditMode = DataGridViewEditMode.EditProgrammatically;
            this.ColumnHeadersDefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;
            this.DefaultCellStyle.Alignment = DataGridViewContentAlignment.MiddleCenter;

            // Add a TextBox control to the first row
            DataGridViewTextBoxColumn col = new DataGridViewTextBoxColumn();
            col.HeaderText = "Search";
            col.SortMode = DataGridViewColumnSortMode.NotSortable;
            this.Columns.Add(col);
            this.Rows.Add();
            this.Controls.Add(new TextBox());
            this.Controls[0].Top = this.GetCellDisplayRectangle(0, 0, true).Top + 2;
            this.Controls[0].Left = this.GetCellDisplayRectangle(0, 0, true).Left + 2;
            this.Controls[0].Width = this.GetCellDisplayRectangle(0, 0, true).Width - 4;
            this.Controls[0].TextChanged += new EventHandler(MyDataGridView_TextChanged);
        }

        public string SearchText
        {
            get { return this.Controls[0].Text; }
        }

        private void MyDataGridView_TextChanged(object sender, EventArgs e)
        {
            this.DataSource = null;
            this.Rows.Clear();
            this.Columns.Clear();
            DataGridViewTextBoxColumn col = new DataGridViewTextBoxColumn();
            col.HeaderText = "Search";
            col.SortMode = DataGridViewColumnSortMode.NotSortable;
            this.Columns.Add(col);
            this.Rows.Add();
            this.Controls.Add(new TextBox());
            this.Controls[0].Top = this.GetCellDisplayRectangle(0, 0, true).Top + 2;
            this.Controls[0].Left = this.GetCellDisplayRectangle(0, 0, true).Left + 2;
            this.Controls[0].Width = this.GetCellDisplayRectangle(0, 0, true).Width - 4;
            this.Controls[0].TextChanged += new EventHandler(MyDataGridView_TextChanged);

            foreach (DataGridViewColumn column in this.Columns)
            {
                column.DataPropertyName = column.HeaderText;
            }

            // TODO: Perform search and update DataGridView with results
        }
    }
}

MySearchControl.cs:

using System;
using System.Windows.Forms;

namespace MySearchControl
{
    public partial class MySearchControl : UserControl
    {
        public MySearchControl()
        {
            InitializeComponent();
            MyDataGridView dataGridView = new MyDataGridView();
            dataGridView.Dock = DockStyle.Fill;
            dataGridView.SearchTextChanged += new EventHandler(MySearchControl_SearchTextChanged);
            this.Controls.Add(dataGridView);
        }

        public DataGridView DataGridView
        {
            get { return (DataGridView)this.Controls[0]; }
        }

        private void MySearchControl_SearchTextChanged(object sender, EventArgs e)
        {
            // TODO: Perform search and update DataGridView with results
        }

        private void btnSearch_Click(object sender, EventArgs e)
        {
            // TODO: Perform search using search text from DataGridView
        }
    }
}

在WinForm中添加MySearchControl控件：

MySearchControl.MySearchControl mySearchControl1 = new MySearchControl.MySearchControl();
mySearchControl1.Dock = DockStyle.Fill;
this.Controls.Add(mySearchControl1);