您好我正在关注此guide以了解如何使用DataGrid。
我遇到的问题是如何将数据从DataGrid转换为DataTable?
我正在尝试的代码是:
DataTable dt = ((DataView)dg.ItemsSource).ToTable();
但它给出了一个错误说明:
无法投射类型的对象 'System.Collections.Generic.List`1 [WPFProject.Person]'输入 'System.Data.DataView'。
我的代码与示例非常相似,只是我使用Person而不是user,我创建了一个Person类型的列表,以便将数据插入到datagrid中。
public class Person
{
public bool CheckBox { get; set; }
public int ID { get; set; }
public string Name { get; set; }
}
谢谢。
答案 0 :(得分:1)
你不能这样转换它。只有ItemSource
的{{1}}不是DataGrid
时,您的代码才有效。您需要明确编写代码(您可以轻松地将其搜索到 DataView
到collection<T>
)以将DataTable
转换为collection
。看看下面的例子:
<强> XAML 强>
DataTable
<强> 逻辑: 强>
<StackPanel>
<DataGrid ItemsSource="{Binding list}" x:Name="myGrid"/>
<Button Content="convert back" Click="Button_Click_1" />
</StackPanel>
<强> 输出 强>
答案 1 :(得分:0)
你不能像在winforms中那样在WPF中这样做。在Wpf中,您可以像这样在dataTable中设置datagrid ItemsSource。
dg.ItemsSource = dataTable.AsDataView();
在您的情况下,您希望从 datagrid 获取 dataTable 。 所以你可以试试下面的代码。
DataView view = (DataView) dg.ItemsSource;
DataTable dataTable = view.Table.Clone();
foreach (var dataRowView in view)
{
dataTable.ImportRow(dataRowView.Row);
}
var dataTableFromDataGrid = dataTable;
答案 2 :(得分:0)
要将DataGrid转换为DataTable
1.DataGrid项源与CandidateClass列表绑定。
2。从DataGrid的Itemsource获取该Item,然后将其序列化为Json并作为DataTable反序列化。
var Item = ListDataGrid.ItemsSource as IList<CandidateClass>;
var json = JsonConvert.SerializeObject(Item);
DataTable dt = (DataTable)JsonConvert.DeserializeObject(json, (typeof(DataTable)));
注意:如果DataGrid是基于类对象列表形成的,则此方法很有帮助。
答案 3 :(得分:0)
复制过去的方法1
public static DataTable DataGridtoDataTable(DataGrid dg)
{
dg.SelectAllCells();
dg.ClipboardCopyMode = DataGridClipboardCopyMode.IncludeHeader;
ApplicationCommands.Copy.Execute(null, dg);
dg.UnselectAllCells();
String result = (string)Clipboard.GetData(DataFormats.CommaSeparatedValue);
string[] Lines = result.Split(new string[] { "\r\n", "\n" },
StringSplitOptions.None);
string[] Fields;
Fields = Lines[0].Split(new char[] { ',' });
int Cols = Fields.GetLength(0);
DataTable dt = new DataTable();
//1st row must be column names; force lower case to ensure matching later on.
for (int i = 0; i < Cols; i++)
dt.Columns.Add(Fields[i].ToUpper(), typeof(string));
DataRow Row;
for (int i = 1; i < Lines.GetLength(0)-1; i++)
{
Fields = Lines[i].Split(new char[] { ',' });
Row = dt.NewRow();
for (int f = 0; f < Cols; f++)
{
Row[f] = Fields[f];
}
dt.Rows.Add(Row);
}
return dt;
}
================================================ =======================================
方法2
public DataTable DataGridtoDataTable(DataGrid dg)
{
DataTable dt = new DataTable();
for (int i = 0; i <= dg.Columns.Count - 1; i++)
{
dt.Columns.Add(dg.Columns[i].Header.ToString(), typeof(string));
}
DataRow Row;
for (int i = 0; i <= dg.Items.Count - 1; i++)
{
Row = dt.NewRow();
for (int k = 0; k <= dg.Columns.Count - 1; k++)
{
Row[dg.Columns[k].Header.ToString()] = gettabelcell(i, k,dg);
}
dt.Rows.Add(Row);
}
return dt;
}
public String gettabelcell(int x, int y,DataGrid dg)
{
try
{
String myString = dg.GetCell(x, y).ToString();
if (myString.Contains(":"))
{
String[] s = myString.Split(':');
String item = s[1];
return item.Trim();
}
else
{
return "";
}
}
catch
{
return "";
}
}
这是课
static class ExtensionHelpers
{
public static T GetVisualChild<T>(Visual parent) where T : Visual
{
T child = default(T);
int numVisuals = VisualTreeHelper.GetChildrenCount(parent);
for (int i = 0; i < numVisuals; i++)
{
Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);
child = v as T;
if (child == null)
{
child = GetVisualChild<T>(v);
}
if (child != null)
{
break;
}
}
return child;
}
public static DataGridCell GetCell(this DataGrid grid, int row, int column)
{
DataGridRow rowContainer = grid.GetRow(row);
return grid.GetCell(rowContainer, column);
}
public static DataGridRow GetSelectedRow(this DataGrid grid)
{
return (DataGridRow)grid.ItemContainerGenerator.ContainerFromItem(grid.SelectedItem);
}
public static DataGridRow GetRow(this DataGrid grid, int index)
{
DataGridRow row = (DataGridRow)grid.ItemContainerGenerator.ContainerFromIndex(index);
if (row == null)
{
// May be virtualized, bring into view and try again.
grid.UpdateLayout();
grid.ScrollIntoView(grid.Items[index]);
row = (DataGridRow)grid.ItemContainerGenerator.ContainerFromIndex(index);
}
return row;
}
public static DataGridCell GetCell(this DataGrid grid, DataGridRow row, int column)
{
if (row != null)
{
DataGridCellsPresenter presenter = GetVisualChild<DataGridCellsPresenter>(row);
if (presenter == null)
{
grid.ScrollIntoView(row, grid.Columns[column]);
presenter = GetVisualChild<DataGridCellsPresenter>(row);
}
DataGridCell cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(column);
return cell;
}
return null;
}
}