C# 如何清除数据网格视图
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How to clear a data grid view
提问by Wizard
I am trying to populate a DataGridView based on the selected item in a ComboBox, I have this part working.
我正在尝试根据 ComboBox 中的选定项目填充 DataGridView，这部分工作正常。
However, I need to be able to clear the grid before adding the new data from a new item rather than it just adding on to the end.
但是，我需要能够在从新项目添加新数据之前清除网格，而不仅仅是添加到最后。
How do I clear a DataGridView before adding items to it?
如何在向 DataGridView 添加项目之前清除它？
采纳答案by Trevor Pilley
Firstly, null the data source:
首先，将数据源设为 null：
this.dataGridView.DataSource = null;
Then clear the rows:
然后清除行：
this.dataGridView.Rows.Clear();
Then set the data source to the new list:
然后将数据源设置为新列表：
this.dataGridView.DataSource = this.GetNewValues();
回答by Pankaj Agarwal
DataGrid.DataSource = null;
DataGrid.DataBind();
回答by Priyank Patel
You can clear DataGridViewin this manner
您可以DataGridView通过这种方式 清除
dataGridView1.Rows.Clear();
dataGridView1.Refresh();
If it is databoundthen try this
如果是，databound那么试试这个
dataGridView1.Rows.Clear() // If dgv is bound to datatable
dataGridView1.DataBind();
回答by Asif
dataGridView1.Rows.Clear();
dataGridView1.Refresh();
回答by Rohit Vyas
You can assign the datasource as null of your data grid and then rebind it.
您可以将数据源分配为数据网格的空值，然后重新绑定它。
dg.DataSource = null;
dg.DataBind();
回答by vignesh
refresh the datagridview and refresh the datatable
刷新datagridview并刷新datatable
dataGridView1.Refresh();
datatable.Clear();
回答by HarshPritesh
datatable.Clear();
dataGridView1.DataSource = datatable;
回答by user3595795
Solution is:
解决办法是：
while (dataGridView1.RowCount > 1)
{
dataGridView1.Rows.RemoveAt(0);
}
回答by valhalla
If you want to clear all the headers as well as the data, for example if you are switching between 2 totally different databases with different fields, therefore different columns and column headers, I found the following to work. Otherwise when you switch you have the columns/ fields from both databases showing in the grid.
如果您想清除所有标题和数据，例如，如果您在具有不同字段的 2 个完全不同的数据库之间切换，因此不同的列和列标题，我发现以下方法有效。否则，当您切换时，两个数据库中的列/字段都会显示在网格中。
dataTable.Dispose();//get rid of existing datatable
dataTable = new DataTable();//create new datatable
datagrid.DataSource = dataTable;//clears out the datagrid with empty datatable
//datagrid.Refresh(); This does not seem to be neccesary
dataadapter.Fill(dataTable); //assumming you set the adapter with new data
datagrid.DataSource = dataTable;
回答by Jon649
If it's bound to a datasource -
如果它绑定到数据源 -
dataGridView.DataSource=null;
dataGridView.Rows.Clear();
Worked for me.
为我工作。
