1

我正在尝试从 WCF 数据服务 Web 服务返回数据集。我遇到的问题是直到运行时我才知道类型。

我遵循了此处概述的方法：http: //blogs.msdn.com/b/vitek/archive/2010/11/09/adding-multi-value-properties-to-untyped-providers.aspx

我基本上处于可以从调用中从 DataTable 返回数据的位置。问题是我不能一次通话。我使用以下代码来构建我的输出：

    protected override DSPContext CreateDataSource()
    {
        DSPContext context = new DSPContext();

        ResourceSet viewsSet, viewRowsSet, viewRowValuesSet;
        this.Metadata.TryResolveResourceSet("Views", out viewsSet);
        this.Metadata.TryResolveResourceSet("ViewRows", out viewRowsSet);
        this.Metadata.TryResolveResourceSet("ViewRowValues", out viewRowValuesSet);

        IList<DSPResource> views = context.GetResourceSetEntities(viewsSet.Name);
        IList<DSPResource> viewRows = context.GetResourceSetEntities(viewRowsSet.Name);
        IList<DSPResource> viewRowValues = context.GetResourceSetEntities(viewRowValuesSet.Name);

        int viewID = 71;

        DataTable dtData = GetDataForView(viewID);

        var viewObj = new DSPResource(viewsSet.ResourceType);
        viewObj.SetValue("ViewID", viewID);
        viewObj.SetValue("ViewRows", new List<DSPResource>());
        views.Add(viewObj);

        int idx = 0;
        foreach (DataRow dr in dtData.Rows)
        {
            var viewRowObj = new DSPResource(viewRowsSet.ResourceType);
            viewRowObj.SetValue("RowID", idx);
            viewRowObj.SetValue("ViewRowValues", new List<DSPResource>());
            //viewRows.Add(viewRowObj);

            int innerIDX = 0;
            foreach (object colVal in dr.ItemArray)
            {
                var viewRowValue = new DSPResource(viewRowValuesSet.ResourceType);
                viewRowValue.SetValue("FieldName", dtData.Columns[innerIDX].ColumnName);
                viewRowValue.SetValue("FieldValue", colVal.ToString());

                ((List<DSPResource>)viewRowObj.GetValue("ViewRowValues")).Add(viewRowValue);

                innerIDX++;
            }


            ((List<DSPResource>)viewObj.GetValue("ViewRows")).Add(viewRowObj);
            idx++;                
        }


        return context;
    }


    protected override DSPMetadata CreateDSPMetadata()
    {
        DSPMetadata metadata = new DSPMetadata("LogixWCFService", "LogixWCF");

        ResourceType view = metadata.AddEntityType("View");
        metadata.AddKeyProperty(view, "ViewID", typeof(int));

        ResourceType viewRow = metadata.AddEntityType("ViewRow");
        metadata.AddKeyProperty(viewRow, "RowID", typeof(int));

        ResourceType viewRowValue = metadata.AddEntityType("ViewRowValue");
        metadata.AddKeyProperty(viewRowValue, "FieldName", typeof(string));
        metadata.AddPrimitiveProperty(viewRowValue, "FieldValue", typeof(string));          

        ResourceSet views = metadata.AddResourceSet("Views", view);
        ResourceSet viewRows = metadata.AddResourceSet("ViewRows", viewRow);
        ResourceSet viewRowValues = metadata.AddResourceSet("ViewRowValues", viewRowValue);

        metadata.AddResourceReferenceProperty(viewRow, "View", views);
        metadata.AddResourceSetReferenceProperty(view, "ViewRows", viewRows);

        metadata.AddResourceReferenceProperty(viewRowValue, "ViewRow", viewRows);
        metadata.AddResourceSetReferenceProperty(viewRow, "ViewRowValues", viewRowValues);

        return metadata;
    }

当我尝试 URL“http://localhost/Test.svc/Views()/ViewRows”时，我得到一个行列表，每一行都有一个 ID 和该行中的字段值集合。所有 web 服务返回的是 RowID 列表。为了获取每一行的集合，我需要为每一行调用以下 URL“http://localhost/Test.svc/Views()/ViewRows”。

我希望能够一次性返回所有数据，而不是进行多个服务器调用。

任何人都可以帮助我如何做到这一点？

4

0 回答 0