[英]Join two datatable using LINQ and get result in other datatable
我有兩個數據表,我正在加入它們以選擇一些匹配的記錄,我需要從兩個表中將一些列作為新結果集,我正在這樣做
Dim query4 = From x In dtblPolicyFormStopCodes.AsEnumerable() Join y In dtblPolicyFormLetterReq.AsEnumerable()
On x.Field(Of String)("Code") Equals y.Field(Of String)("Code") _
Select New With _
{ _
.Code = x.Field(Of String)("Code"), _
.Sequence = x.Field(Of Integer)("Sequence "), _
.FieldDataType= x.Field(Of String)("FieldDataType"), _
.FieldValue= y.Field(Of String)("FieldValue") _
}
MyNewDataTable = GetDynamicTableSchema()
query4.Cast(Of DataRow).CopyToDataTable(MyNewDataTable, LoadOption.OverwriteChanges)
但是我無法使用兩個數據表的選定列獲取新數據表,請幫助我如何在“ MyNewDataTable”中或作為新數據表獲取新結果集
Public Function GetDynamicTableSchema() As System.Data.DataTable
Dim tblDynamicTableDataMain As System.Data.DataTable = Nothing
Try
tblDynamicTableDataMain = New System.Data.DataTable("DynamicTableData")
With tblDynamicTableDataMain
.Columns.Add("Code")
.Columns.Add("Sequence", System.Type.GetType("System.Int32"))
.Columns.Add("FieldDataType")
.Columns.Add("FieldValue")
End With
Return tblDynamicTableDataMain
End Try
End Function
我通過這種方式實現了我的願望功能
Dim dr As DataRow
Dim MyNewDataTable as Datatable = GetDynamicTableSchema()
Dim query = (From x In dtblPolicyFormStopCodes.AsEnumerable() Join y In dtblPolicyFormLetterReq.AsEnumerable()
On x.Field(Of String)("Code") Equals y.Field(Of String)("Code")) _
.Select(Function(a) As DataRow
dr = MyNewDataTable.NewRow()
dr("Code") = a.x.Field(Of String)("Code")
dr("Sequence") = a.x.Field(Of Integer)("Sequence")
dr("FieldDataType") = a.x.Field(Of String)("FieldDataType")
dr("FieldValue") = a.y.Field(Of String)("Fieldvalue")
Return dr
End Function)
MyNewDataTable = query.CopyToDataTable()
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