在列中的DataGridView中搜索值

时间:2012-11-01 09:09:34

标签: c# winforms datagridview datagridviewcolumn

我希望用户能够在DataGridView(dgv)的列中搜索数字。 dgv可以保存很多记录。每条记录都有一个项目编号。所以我希望用户能够在项目编号列中搜索项目编号。我的列是:ProjectID(不可见);图像(无headertext);项目编号;项目名;公司;接触。

这是我的代码:

private void btnSearch_Click(object sender, EventArgs e)
{
    string searchValue = textBox1.Text;
    int rowIndex = -1;

    dgvProjects.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
    try
    {
        foreach (DataGridViewRow row in dgvProjects.Rows)
        {
            if (row.Cells[row.Index].Value.ToString().Equals(searchValue))
            {
                rowIndex = row.Index;
                dgvProjects.Rows[row.Index].Selected = true;
                break;
            }
        }
    }
    catch (Exception exc)
    {
        MessageBox.Show(exc.Message);
    }
}

问题#1:到目前为止:用户在TextBox1中键入项目编号。当他/她单击按钮时,代码会在行中搜索此字符串,当找到项目编号时,该行将被选中。它工作正常,但只有一次。当我想搜索其他项目编号时,没有任何反应。

问题#2:我认为只需搜索“项目名称”列的值,就可以更好地完成此操作。但是我该怎么做呢?

我用于搜索的代码来自this answer

6 个答案:

答案 0 :(得分:18)

为什么使用row.Cells [row.Index]。您需要指定要搜索的列的索引(问题#2)。例如,您需要将row.Cells [row.Index]更改为row.Cells [2],其中2是列的索引:

private void btnSearch_Click(object sender, EventArgs e)
{
    string searchValue = textBox1.Text;

    dgvProjects.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
    try
    {
        foreach (DataGridViewRow row in dgvProjects.Rows)
        {
            if (row.Cells[2].Value.ToString().Equals(searchValue))
            {
                row.Selected = true;
                break;
            }
        }
    }
    catch (Exception exc)
    {
        MessageBox.Show(exc.Message);
    }
}

答案 1 :(得分:1)

最好在另一种方法中分离你的逻辑,或者在另一种方法中分离你的逻辑。

此方法将帮助您检索找到文本的DataGridViewCell对象。

    /// <summary>
    /// Check if a given text exists in the given DataGridView at a given column index
    /// </summary>
    /// <param name="searchText"></param>
    /// <param name="dataGridView"></param>
    /// <param name="columnIndex"></param>
    /// <returns>The cell in which the searchText was found</returns>
    private DataGridViewCell GetCellWhereTextExistsInGridView(string searchText, DataGridView dataGridView, int columnIndex)
    {
        DataGridViewCell cellWhereTextIsMet = null;

        // For every row in the grid (obviously)
        foreach (DataGridViewRow row in dataGridView.Rows)
        {
            // I did not test this case, but cell.Value is an object, and objects can be null
            // So check if the cell is null before using .ToString()
            if (row.Cells[columnIndex].Value != null && searchText == row.Cells[columnIndex].Value.ToString())
            {
                // the searchText is equals to the text in this cell.
                cellWhereTextIsMet = row.Cells[columnIndex];
                break;
            }
        }

        return cellWhereTextIsMet;
    }

    private void button_click(object sender, EventArgs e)
    {
        DataGridViewCell cell = GetCellWhereTextExistsInGridView(textBox1.Text, myGridView, 2);
        if (cell != null)
        {
            // Value exists in the grid
            // you can do extra stuff on the cell
            cell.Style = new DataGridViewCellStyle { ForeColor = Color.Red };
        }
        else
        {
            // Value does not exist in the grid
        }
    }

答案 2 :(得分:0)

//     This is the exact code for search facility in datagridview.
private void buttonSearch_Click(object sender, EventArgs e)
{
    string searchValue=textBoxSearch.Text;
    int rowIndex = 1;  //this one is depending on the position of cell or column
    //string first_row_data=dataGridView1.Rows[0].Cells[0].Value.ToString() ;

    dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
    try
    {
        bool valueResulet = true;
        foreach (DataGridViewRow row in dataGridView1.Rows)
        {
            if (row.Cells[rowIndex].Value.ToString().Equals(searchValue))
            {
                rowIndex = row.Index;
                dataGridView1.Rows[rowIndex].Selected = true;
                rowIndex++;
                valueResulet = false;
            }
        }
        if (valueResulet != false)
        {
            MessageBox.Show("Record is not avalable for this Name"+textBoxSearch.Text,"Not Found");
            return;
        }
    }
    catch (Exception exc)
    {
        MessageBox.Show(exc.Message);
    }
}

答案 3 :(得分:0)

为什么不首先构建DataTable,然后将其DataGridView分配给DataSource

DataTable table4DataSource=new DataTable();

table4DataSource.Columns.Add("col00");
table4DataSource.Columns.Add("col01");
table4DataSource.Columns.Add("col02");

...

(手动,循环或通过数据库表中的DataReader添加行) (分配数据源)

dtGrdViewGrid.DataSource = table4DataSource;

然后使用:

(dtGrdViewGrid.DataSource as DataTable).DefaultView.RowFilter = "col00 = '" + textBoxSearch.Text+ "'";
dtGrdViewGrid.Refresh();

您甚至可以将此段代码放在textbox_textchange事件中,并在您编写时显示过滤后的值。

答案 4 :(得分:0)

直接从DataTableDataset

过滤数据
"MyTable".DefaultView.RowFilter = "<DataTable Field> LIKE '%" + textBox1.Text + "%'";
   this.dataGridView1.DataSource = "MyTable".DefaultView;

KeyUp的事件Textbox上使用此代码,为您的表名或数据集替换“MyTable”,替换您想要搜索的字段。

答案 5 :(得分:0)

&#34; MyTable&#34; .DefaultView.RowFilter =&#34;喜欢&#39;%&#34; + textBox1.Text +&#34;%&#39;&#34 ;;  this.dataGridView1.DataSource =&#34; MyTable&#34; .DefaultView;

与数据库连接和Datatable的关系如何?我应该如何设置DefaultView正确?

我使用此代码来获取数据:

con = new System.Data.SqlServerCe.SqlCeConnection();
con.ConnectionString = "Data Source=C:\\Users\\mhadj\\Documents\\Visual Studio 2015\\Projects\\data_base_test_2\\Sample.sdf";
con.Open();

DataTable dt = new DataTable();

adapt = new System.Data.SqlServerCe.SqlCeDataAdapter("select * from tbl_Record", con);        
adapt.Fill(dt);        
dataGridView1.DataSource = dt;
con.Close();