我创建了一个动态网格，但是在尝试添加分页工具栏时，我收到“运行时错误-”未定义为空或不是对象”。
//ascx代码
<%@ Control Language="C#" ClassName="Defatult3UserContorl" %>
<%@ Import Namespace="System.Collections.Generic" %>
<%@ Import Namespace="System.Data.SqlClient" %>
<%@ Import Namespace="System.Data" %>
<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
<script runat="server">
private DataTable GetDataTable()
{
DataTable table = new DataTable();
table.Columns.AddRange(new DataColumn[] {
new DataColumn("Company") { ColumnName = "Company", DataType = typeof(string) },
new DataColumn("Price") { ColumnName = "Price", DataType = typeof(double) },
new DataColumn("Change") { ColumnName = "Change", DataType = typeof(double) },
new DataColumn("PctChange") { ColumnName = "PctChange", DataType = typeof(double) },
new DataColumn("PctChange") { ColumnName = "LastChange", DataType = typeof(DateTime) }
});
foreach (object[] obj in this.Data)
{
table.Rows.Add(obj);
}
return table;
}
private object[] Data
{
get
{
DateTime now = DateTime.Now;
return new object[]
{
new object[] { "3m Co", 71.72, 0.02, 0.03, now },
new object[] { "Alcoa Inc", 29.01, 0.42, 1.47, now },
new object[] { "Altria Group Inc", 83.81, 0.28, 0.34, now },
new object[] { "American Express Company", 52.55, 0.01, 0.02, now },
new object[] { "American International Group, Inc.", 64.13, 0.31, 0.49, now },
new object[] { "AT&T Inc.", 31.61, -0.48, -1.54, now },
new object[] { "Boeing Co.", 75.43, 0.53, 0.71, now },
new object[] { "Caterpillar Inc.", 67.27, 0.92, 1.39, now },
new object[] { "Citigroup, Inc.", 49.37, 0.02, 0.04, now },
new object[] { "E.I. du Pont de Nemours and Company", 40.48, 0.51, 1.28, now },
new object[] { "Exxon Mobil Corp", 68.1, -0.43, -0.64, now },
new object[] { "General Electric Company", 34.14, -0.08, -0.23, now },
new object[] { "General Motors Corporation", 30.27, 1.09, 3.74, now },
new object[] { "Hewlett-Packard Co.", 36.53, -0.03, -0.08, now },
new object[] { "Honeywell Intl Inc", 38.77, 0.05, 0.13, now },
new object[] { "Intel Corporation", 19.88, 0.31, 1.58, now },
new object[] { "International Business Machines", 81.41, 0.44, 0.54, now },
new object[] { "Johnson & Johnson", 64.72, 0.06, 0.09, now },
new object[] { "JP Morgan & Chase & Co", 45.73, 0.07, 0.15, now },
new object[] { "McDonald\"s Corporation", 36.76, 0.86, 2.40, now },
new object[] { "Merck & Co., Inc.", 40.96, 0.41, 1.01, now },
new object[] { "Microsoft Corporation", 25.84, 0.14, 0.54, now },
new object[] { "Pfizer Inc", 27.96, 0.4, 1.45, now },
new object[] { "The Coca-Cola Company", 45.07, 0.26, 0.58, now },
new object[] { "The Home Depot, Inc.", 34.64, 0.35, 1.02, now },
new object[] { "The Procter & Gamble Company", 61.91, 0.01, 0.02, now },
new object[] { "United Technologies Corporation", 63.26, 0.55, 0.88, now },
new object[] { "Verizon Communications", 35.57, 0.39, 1.11, now },
new object[] { "Wal-Mart Stores, Inc.", 45.45, 0.73, 1.63, now }
};
}
}
private GridPanel createDynamicGrid()
{
Store store1 = new Store();
GridPanel grid = new GridPanel();
Ext.Net.Model model = new Model();
for (int i = 0; i < 2; i++)
{
ModelField modelField = new ModelField();
if (i == 0)
modelField.Name = "Company";
else
modelField.Name = "Price";
model.Fields.Add(modelField);
}
store1.Model.Add(model);
store1.DataSource = this.GetDataTable();
grid.Store.Add(store1);
grid.SelectionModel.Add(new RowSelectionModel { Mode = SelectionMode.Single });
grid.ColumnModel.Columns.Add(new ColumnBase[] {
new Column
{
Text = "Company",
DataIndex = "Company",
Flex = 1
},
new Column
{
Text = "Price",
DataIndex = "Price"
}
});
PagingToolbar pagging=new PagingToolbar();
grid.BottomBar.Add(pagging);
return grid;
}
protected void btnSearch_Click(object sender, DirectEventArgs e)
{
createDynamicGrid().Render(this.frmGrid, RenderMode.AddTo);
}
</script>
<ext:FormPanel ID="frmPanel1" runat="server">
<Items>
<ext:Button runat="server" ID="btnSearch" Text="Search" Icon="FeedMagnify" X="150"
Y="10">
<DirectEvents>
<Click OnEvent="btnSearch_Click" />
</DirectEvents>
</ext:Button>
<ext:FormPanel ID="frmGrid" runat="server">
<Items>
</Items>
</ext:FormPanel>
</Items>
</ext:FormPanel>
//aspx页面
<%@ Page Language="C#" %>
<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
<%@ Register TagName="Table" TagPrefix="uc" Src="~/MiscExamples/Defatult3UserContorl.ascx" %>
<!DOCTYPE html>
<html>
<head id="Head1" runat="server">
<title>Ext.NET Examples</title>
<script runat="server">
</script>
</head>
<body>
<form id="form1" runat="server">
<ext:ResourceManager ID="ResourceManager1" runat="server" />
<ext:FormPanel ID="frmPanel1" runat="server">
<Content>
<uc:Table runat="server" ID="SearchTable" title="Search Table" />
</Content>
</ext:FormPanel>
</form>
</body>
</html>
在上面的示例中，我有一个用户控制，我在其中动态创建 GridPanel。在网格面板中，我想在一页中使用 10 条记录进行分页。但是在尝试添加 pagingToolbar "PagingToolbar paging=new PagingToolbar(); grid.BottomBar.Add(pagging);" 它向我抛出运行时错误。你能帮帮我吗？感谢您的帮助。提前致谢。