Question

我尝试使用Telerik UI为WinForms创建一个分层GridView，其中包含两个用于获取数据的SQL查询。

我找到了这个代码示例：http://www.telerik.com/help/winforms/gridview-hierarchical-grid-binding-to-hierarchical-data-programmatically.html

但他们使用Northwind DataSet。（我不会通过VS2008 SQL连接向导连接到我的SQL数据库。）

private void LoadUnboundData()
{
    using (radGridView1.DeferRefresh())
    {
        for (int i = 0; i < nwindDataSet.Employees.Count; i++)
        ...

如何通过SQLDataReader使用我自己的数据集？

我正在使用C＃的Visual Studio 2008和带有AdventureWorks数据库示例的SQL Express 2012 Server。

欢迎提出建议最诚挚的问候

Answer 1

以下是一篇描述如何使用数据阅读器的文章：http://www.telerik.com/help/winforms/gridview-populating-with-data-binding-to-datareader.html

Answer 2

如果您要执行此“ OnDemand”或立即预加载所有内容，我并不满意。您可以先参考我在Telerik论坛上提供的有关OnDemand负载的答案，然后对其进行更改以适合您的需求。该逻辑将使用一个数据表，您可以从任何数据源（如ODBC）加载该数据表。

链接：https://www.telerik.com/forums/ondemand-hierarchical-datagrid#Cy41z5kzRUG-44fhLidpeQ

代码示例：

using System;
using System.Data;
using Telerik.WinControls.UI;

namespace example
{
    public partial class frmtest : Telerik.WinControls.UI.RadForm
    {
        private DataTable _parentData = new DataTable();

        public frmtest()
        {
            InitializeComponent();
        }

        private void frmtest_Load(object sender, EventArgs e)
        {
            _parentData = exampleParentDataTableLoad(); // Replace with call to populate a datatable from a query
            loadGridAndParentRecords();
        }

        private void loadGridAndParentRecords()
        {
            exampleRadGridView.DataSource = _parentData;
            var _childTemplate = CreateChildTemplate();
            exampleRadGridView.Templates.Add(_childTemplate);
            _childTemplate.HierarchyDataProvider = new GridViewEventDataProvider(_childTemplate);
            exampleRadGridView.RowSourceNeeded += ExampleRadGridView_RowSourceNeeded;
        }

        private GridViewTemplate CreateChildTemplate()
        {
            GridViewTemplate template = new GridViewTemplate();
            template.AutoSizeColumnsMode = GridViewAutoSizeColumnsMode.Fill;
            template.Columns.Add(new GridViewTextBoxColumn
            {
                Name = "Id",
                HeaderText = "ID"
            });
            template.Columns.Add(new GridViewTextBoxColumn
            {
                Name = "SampleNumber",
                HeaderText = "Sample Number"
            });
            template.Columns.Add(new GridViewTextBoxColumn
            {
                Name = "ParentId",
                HeaderText = "Parent Id"
            });

            return template;
        }

        private void ExampleRadGridView_RowSourceNeeded(object sender, Telerik.WinControls.UI.GridViewRowSourceNeededEventArgs e)
        {
            if (e.ParentRow != null)
            {
                if (e.ParentRow.DataBoundItem is DataRowView rowViewData)
                {
                    var _childDataTable = exampleChildTableLoad(); // Replace with call to populate a datatable from a query

                    var _dataRows = _childDataTable.Select($"ParentId = {rowViewData["Id"]}");

                    foreach (DataRow row in _dataRows)
                    {
                        GridViewRowInfo _newRowObj = e.Template.Rows.NewRow();
                        _newRowObj.Cells["Id"].Value = row["Id"];
                        _newRowObj.Cells["SampleNumber"].Value = row["SampleNumber"];
                        _newRowObj.Cells["ParentId"].Value = row["ParentId"];
                        e.SourceCollection.Add(_newRowObj);
                    }
                }
            }
        }

        private DataTable exampleParentDataTableLoad()
        {
            DataTable _return = new DataTable();
            _return.Columns.Add("Id", typeof(int));
            _return.Columns.Add("DisplayName", typeof(string));

            _return.Rows.Add(1, "Test1");
            _return.Rows.Add(2, "Test2");

            return _return;
        }

        private DataTable exampleChildTableLoad()
        {
            DataTable _return = new DataTable();
            _return.Columns.Add("Id", typeof(int));
            _return.Columns.Add("SampleNumber", typeof(string));
            _return.Columns.Add("ParentId", typeof(int));

            _return.Rows.Add(9999, "Test1", 2);
            _return.Rows.Add(9998, "Test2", 2);
            _return.Rows.Add(9997, "Test3", 2);
            _return.Rows.Add(9996, "Test4", 1);
            _return.Rows.Add(9995, "Test5", 1);
            _return.Rows.Add(9994, "Test6", 1);

            return _return;
        }
    }
}

C＃使用Telerik UI为带有SQL查询的WinForms创建分层GridView

2 个答案: