过滤数据集

发布于 2024-11-07 15:47:28 字数 161 浏览 0 评论 0原文

我有一个充满客户的数据集。我想知道是否有任何方法可以过滤数据集并仅获取我想要的信息。例如,要获取具有 CostumerID = 1 的客户的 CostumerNameCostumerAddress

是否可能?

I have a DataSet full of costumers. I was wondering if there is any way to filter the dataset and only get the information I want. For example, to get CostumerName and CostumerAddress for a costumer that has CostumerID = 1

Is it possible?

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眼前雾蒙蒙 2024-11-14 15:47:29

没有提到合并吗?

DataSet newdataset = new DataSet();

newdataset.Merge( olddataset.Tables[0].Select( filterstring, sortstring ));

No mention of Merge?

DataSet newdataset = new DataSet();

newdataset.Merge( olddataset.Tables[0].Select( filterstring, sortstring ));
醉南桥 2024-11-14 15:47:29

上面的内容非常接近。这是我的解决方案:

Private Sub getDsClone(ByRef inClone As DataSet, ByVal matchStr As String, ByRef outClone As DataSet)
    Dim i As Integer

    outClone = inClone.Clone
    Dim dv As DataView = inClone.Tables(0).DefaultView
    dv.RowFilter = matchStr
    Dim dt As New DataTable
    dt = dv.ToTable
    For i = 0 To dv.Count - 1
        outClone.Tables(0).ImportRow(dv.Item(i).Row)
    Next
End Sub

The above were really close. Here's my solution:

Private Sub getDsClone(ByRef inClone As DataSet, ByVal matchStr As String, ByRef outClone As DataSet)
    Dim i As Integer

    outClone = inClone.Clone
    Dim dv As DataView = inClone.Tables(0).DefaultView
    dv.RowFilter = matchStr
    Dim dt As New DataTable
    dt = dv.ToTable
    For i = 0 To dv.Count - 1
        outClone.Tables(0).ImportRow(dv.Item(i).Row)
    Next
End Sub
场罚期间 2024-11-14 15:47:28

您可以使用DataTable.Select

var strExpr = "CostumerID = 1 AND OrderCount > 2";
var strSort = "OrderCount DESC";

// Use the Select method to find all rows matching the filter.
foundRows = ds.Table[0].Select(strExpr, strSort);  

或者您可以使用DataView

ds.Tables[0].DefaultView.RowFilter = strExpr;  

UPDATE 我不确定您为什么要返回DataSet。但我会采用以下解决方案:

var dv = ds.Tables[0].DefaultView;
dv.RowFilter = strExpr;
var newDS = new DataSet();
var newDT = dv.ToTable();
newDS.Tables.Add(newDT);

You can use DataTable.Select:

var strExpr = "CostumerID = 1 AND OrderCount > 2";
var strSort = "OrderCount DESC";

// Use the Select method to find all rows matching the filter.
foundRows = ds.Table[0].Select(strExpr, strSort);  

Or you can use DataView:

ds.Tables[0].DefaultView.RowFilter = strExpr;  

UPDATE I'm not sure why you want to have a DataSet returned. But I'd go with the following solution:

var dv = ds.Tables[0].DefaultView;
dv.RowFilter = strExpr;
var newDS = new DataSet();
var newDT = dv.ToTable();
newDS.Tables.Add(newDT);
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