C# 根据列和值在dataGridView中查找一行

Find a row in dataGridView based on column and value

提问by Lukas

I have a dataGridView that has 3 columns: SystemId, FirstName, LastName that is bound using database information. I would like to highlight a certain row, which I would do using:

我有一个包含 3 列的 dataGridView：使用数据库信息绑定的 SystemId、FirstName、LastName。我想突出显示某一行，我会使用它：

dataGridView1.Rows[????].Selected = true;

The row ID I however do not know and the bindingsource keeps changing, thus row 10 could be "John Smith" in one instance but not even exist in another (I have a filter that filters out the source based on what user enters, so typing in "joh" would yield all rows where first / last name have "joh" in them, thus my list can go from 50 names to 3 in a click).

然而，我不知道行 ID 并且 bindingsource 不断变化，因此第 10 行在一个实例中可能是“John Smith”，但在另一个实例中甚至不存在（我有一个过滤器，可以根据用户输入的内容过滤源，因此键入在“joh”中将产生名字/姓氏中有“joh”的所有行，因此我的列表可以从 50 个名字变为 3 个）。

I want to find a way how I can select a row based on SystemId and a corresponding number. I can get the system ID using the following method:

我想找到一种方法，如何根据 SystemId 和相应的数字选择一行。我可以使用以下方法获取系统 ID：

systemId = dataGridView1.Rows[dataGridView1.CurrentRow.Index].Cells["SystemId"].Value.ToString();

Now I just need to apply it to the row selector. Something like dataGridView1.Columns["SystemId"].IndexOf(systemId} but that does not work (nor does such method exist). Any help is greatly appreciated.

现在我只需要将它应用到行选择器。像 dataGridView1.Columns["SystemId"].IndexOf(systemId} 之类的东西，但这不起作用（也不存在这种方法）。非常感谢任何帮助。

采纳答案by Habib

This will give you the gridview row index for the value:

这将为您提供该值的 gridview 行索引：

String searchValue = "somestring";
int rowIndex = -1;
foreach(DataGridViewRow row in DataGridView1.Rows)
{
    if(row.Cells[1].Value.ToString().Equals(searchValue))
    {
        rowIndex = row.Index;
        break;
    }
}

Or a LINQ query

或者一个 LINQ 查询

int rowIndex = -1;

        DataGridViewRow row = dgv.Rows
            .Cast<DataGridViewRow>()
            .Where(r => r.Cells["SystemId"].Value.ToString().Equals(searchValue))
            .First();

        rowIndex = row.Index;

then you can do:

那么你可以这样做：

dataGridView1.Rows[rowIndex].Selected = true;

回答by Rodrigo Boratto

If you just want to check if that item exists:

如果您只想检查该项目是否存在：

IEnumerable<DataGridViewRow> rows = grdPdfs.Rows
            .Cast<DataGridViewRow>()
            .Where(r => r.Cells["SystemId"].Value.ToString().Equals(searchValue));
if (rows.Count() == 0) 
{
    // Not Found
} 
else 
{
    // Found
}

回答by Rodrigo Boratto

Or you can use like this. This may be faster.

或者你可以这样使用。这可能会更快。

int iFindNo = 14;
int j = dataGridView1.Rows.Count-1;
int iRowIndex = -1;
for (int i = 0; i < Convert.ToInt32(dataGridView1.Rows.Count/2) +1; i++)
{
    if (Convert.ToInt32(dataGridView1.Rows[i].Cells[0].Value) == iFindNo)
    {
        iRowIndex = i;
        break;
    }
    if (Convert.ToInt32(dataGridView1.Rows[j].Cells[0].Value) == iFindNo)
    {
        iRowIndex = j;
        break;
    }
    j--;
}
if (iRowIndex != -1)
    MessageBox.Show("Index is " + iRowIndex.ToString());
else
    MessageBox.Show("Index not found." );

回答by vahid ghezelvand

Try this:

尝试这个：

        string searchValue = textBox3.Text;
        int rowIndex = -1;

        dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
        try
        {
            foreach (DataGridViewRow row in dataGridView1.Rows)
            {
                if (row.Cells["peseneli"].Value.ToString().Equals(searchValue))
                {
                    rowIndex = row.Index;
                    dataGridView1.CurrentCell = dataGridView1.Rows[rowIndex].Cells[0];
                    dataGridView1.Rows[dataGridView1.CurrentCell.RowIndex].Selected = true;

                    break;
                }
            }
        }
        catch (Exception exc)
        {
            MessageBox.Show(exc.Message);
        }

回答by jaredbaszler

The above answers only work if AllowUserToAddRowsis set to false. If that property is set to true, then you will get a NullReferenceExceptionwhen the loop or Linq query tries to negotiate the new row. I've modified the two accepted answers above to handle AllowUserToAddRows = true.

以上答案仅在AllowUserToAddRows设置为时才有效false。如果该属性设置为true，那么您将NullReferenceException在循环或 Linq 查询尝试协商新行时得到 。我已经修改了上面两个接受的答案来处理AllowUserToAddRows = true.

Loop answer:

循环回答：

String searchValue = "somestring";
int rowIndex = -1;
foreach(DataGridViewRow row in DataGridView1.Rows)
{
    if (row.Cells["SystemId"].Value != null) // Need to check for null if new row is exposed
    {
        if(row.Cells["SystemId"].Value.ToString().Equals(searchValue))
        {
            rowIndex = row.Index;
            break;
        }
    }
}

LINQ answer:

林克回答：

int rowIndex = -1;

bool tempAllowUserToAddRows = dgv.AllowUserToAddRows;

dgv.AllowUserToAddRows = false; // Turn off or .Value below will throw null exception

    DataGridViewRow row = dgv.Rows
        .Cast<DataGridViewRow>()
        .Where(r => r.Cells["SystemId"].Value.ToString().Equals(searchValue))
        .First();

    rowIndex = row.Index;

dgv.AllowUserToAddRows = tempAllowUserToAddRows;

回答by Joey Morgan

This builds on the above answer from Gordon--not all of it is my original work. What I did was add a more generic method to my static utility class.

这建立在 Gordon 的上述回答之上——并非所有这些都是我的原创作品。我所做的是向我的静态实用程序类添加一个更通用的方法。

public static int MatchingRowIndex(DataGridView dgv, string columnName, string searchValue)
        {
        int rowIndex = -1;
        bool tempAllowUserToAddRows = dgv.AllowUserToAddRows;

        dgv.AllowUserToAddRows = false; // Turn off or .Value below will throw null exception
        if (dgv.Rows.Count > 0 && dgv.Columns.Count > 0 && dgv.Columns[columnName] != null)
            {
            DataGridViewRow row = dgv.Rows
                .Cast<DataGridViewRow>()
                .FirstOrDefault(r => r.Cells[columnName].Value.ToString().Equals(searchValue));

            rowIndex = row.Index;
            }
        dgv.AllowUserToAddRows = tempAllowUserToAddRows;
        return rowIndex;
        }

Then in whatever form I want to use it, I call the method passing the DataGridView, column name and search value. For simplicity I am converting everything to strings for the search, though it would be easy enough to add overloads for specifying the data types.

然后以我想要使用的任何形式，调用传递 DataGridView、列名和搜索值的方法。为简单起见，我将所有内容都转换为字符串以进行搜索，尽管添加用于指定数据类型的重载很容易。

private void UndeleteSectionInGrid(string sectionLetter)
        {
        int sectionRowIndex = UtilityMethods.MatchingRowIndex(dgvSections, "SectionLetter", sectionLetter);
        dgvSections.Rows[sectionRowIndex].Cells["DeleteSection"].Value = false;
        }

回答by Deepu Reghunath

Those who use WPF

使用WPF 的人

for (int i = 0; i < dataGridName.Items.Count; i++)
{
      string cellValue= ((DataRowView)dataGridName.Items[i]).Row["columnName"].ToString();                
      if (cellValue.Equals("Search_string")) // check the search_string is present in the row of ColumnName
      {
         object item = dataGridName.Items[i];
         dataGridName.SelectedItem = item; // selecting the row of dataGridName
         dataGridName.ScrollIntoView(item);                    
         break;
      }
}

if you want to get the selected row items after this, the follwing code snippet is helpful

如果您想在此之后获取选定的行项目，以下代码片段会有所帮助

DataRowView drv = dataGridName.SelectedItem as DataRowView;
DataRow dr = drv.Row;
string item1= Convert.ToString(dr.ItemArray[0]);// get the first column value from selected row 
string item2= Convert.ToString(dr.ItemArray[1]);// get the second column value from selected row