C# 如何使用 LINQ 查找 DataGridView 行？
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原文地址: http://stackoverflow.com/questions/15098071/
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How can I use LINQ to find a DataGridView row?
提问by Darrin Doherty
Is there any way to use a LINQ style query to find a DataGridView row? I am trying to find the one bound to a specific object and highlight it.
有没有办法使用 LINQ 样式查询来查找 DataGridView 行？我试图找到绑定到特定对象的那个并突出显示它。
MyDatagrid.Rows.FirstOrDefault(r => r.DataBoundItem == myItem).Selected = true;
Error 1 'System.Windows.Forms.DataGridViewRowCollection' does not contain a definition for 'FirstOrDefault' and no extension method 'FirstOrDefault' accepting a first argument of type 'System.Windows.Forms.DataGridViewRowCollection' could be found (are you missing a using directive or an assembly reference?)
错误 1“System.Windows.Forms.DataGridViewRowCollection”不包含“FirstOrDefault”的定义，并且找不到接受“System.Windows.Forms.DataGridViewRowCollection”类型的第一个参数的扩展方法“FirstOrDefault”（您是否缺少使用指令或程序集引用？）
采纳答案by Lee
You need to cast to IEnumerable<DataGridViewRow>since DataGridViewRowCollectiononly implements IEnumerable:
您需要强制转换为IEnumerable<DataGridViewRow>因为DataGridViewRowCollection仅实现IEnumerable：
MyDatagrid.Rows
.Cast<DataGridViewRow>()
.FirstOrDefault(r => r.DataBoundItem == myItem).Selected = true;
回答by Sturgus
For those who came here looking for the VB-version, Lee's answer translates to:
对于那些来这里寻找 VB 版本的人，Lee 的回答转化为：
MyDatagrid.Rows.Cast(Of DataGridViewRow)().FirstOrDefault(Function(r) r.DataBoundItem Is myItem).Selected = True
Furthermore, if you're like me, and are using this to find your DataGridViewRowfrom your bound DataTable.DataRow(DataGridView.DataSource = DataTable), then you can access it like this:
此外，如果你像我一样，并且正在使用它DataGridViewRow从你的边界DataTable.DataRow( DataGridView.DataSource = DataTable) 中找到你的，那么你可以像这样访问它：
Dim MyDataRowSearch() As DataRow = MyDataTable.Select("SomeColumn = SomeValue")
If MyDataRowSearch.Count = 1 Then
MyDataGrid.Rows.Cast(Of DataGridViewRow)().FirstOrDefault(Function(r) DirectCast(r.DataBoundItem, DataRowView).Row Is MyDataRowSearch(0)).Selected = True
End If
This is much more efficient than looping through your DataGridViewlooking for matching values.
这比循环DataGridView查找匹配值要高效得多。
