1、动态生成控件，无法取得控件的值：
protected void Page_Init(object sender, EventArgs e)
{
ComboBox cmbTest = new ComboBox();
cmbTest.ID = "cmbTest";
InitBooleanDrop(cmbTest);
cmbTest.DirectSelect += new ComponentDirectEvent.DirectEventHandler(cmbTest_DirectSelect);
this.Page.Controls.Add(cmbTest);
}
private void InitBooleanDrop(ComboBox cmb)
{
ListItem item = new ListItem();
item.Text = "---请选择---";
item.Value = "0";
cmb.Items.Add(item);
item = new ListItem();
item.Text = "Y";
item.Value = "1";
cmb.Items.Add(item);
item = new ListItem();
item.Text = "N";
item.Value = "2";
cmb.Items.Add(item);
cmb.SelectedItem.Text = cmb.Items[0].Text;
}
//不能取得选择的值
void cmbTest_DirectSelect(object sender, DirectEventArgs e)
{
ComboBox cmb = (ComboBox)sender;
X.Msg.Alert(cmb.SelectedItem.Text, cmb.SelectedItem.Value).Show();
}
测试了好久，其实问题就出在这句：
this.Page.Controls.Add(cmbTest);
将其改为以下这句就好了：
this.form1.Controls.Add(cmbTest);
2、在代码中控制显示和隐藏控件：
不能直接使用Visible属性来控制，应使用Hide()和Show()两个方法来控制，具体可以参考：
http://forums.ext.net/showthread.php?13114&p=54033&viewfull=1#post54033
http://forums.ext.net/showthread.php?13114&p=54033&viewfull=1#post54033 Visible and Hidden are not the same. If Visible=false then a widget is not rendered at all (it is absent on client side) therefore we cannot change visibility on client side.
You have to rerender the widget after set Visible=true during DirectEvent Widget1.Render(); If Hidden=true then the widget is rendered but hidden in the browser, you can easly to control visiblilty in the client side by Hidden
property during DirectEvent
3、在创建复合控件时，出现“The control with ID '控件ID' not found”：
原因是由于控件没有在“CreateChildControls”方法中创建；
4、GridPanel无法获得选择的行：
原因：设置Store中Model对象的IDProperty属性为字段名即可。
5、用Ext.Net在创建自定义控件时，出现“Token is not unique”的问题：
“/”应用程序中的服务器错误。 -------------------------------------------------------------------------------- Token is not unique ------------------- ID = _ClientInit TagName = anchor Match = <#:anchor id="_ClientInit" /> 说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。 异常详细信息: Transformer.NET.TokenNotUniqueException: Token is not unique ------------------- ID = _ClientInit TagName = anchor Match = <#:anchor id="_ClientInit" /> 源错误: 执行当前 Web 请求期间生成了未处理的异常。可以使用下面的异常堆栈跟踪信息确定有关异常原因和发生位置的信息。 堆栈跟踪: [TokenNotUniqueException: Token is not unique ------------------- ID = _ClientInit TagName = anchor Match = <#:anchor id="_ClientInit" /> ] Transformer.NET.Token.ParseAnchors() +508 Transformer.NET.TextTransformer.Parse(List`1 tokensType, Dictionary`2 variables) +1063 Transformer.NET.TextTransformer.Transform(List`1 tokensType, Dictionary`2 variables) +42 Transformer.NET.TextTransformer.Transform(List`1 tokensType) +41 Transformer.NET.TextTransformer.Transform() +53 Ext.Net.ExtNetTransformer.Transform(String text) +210 Ext.Net.InitScriptFilter.Transform() +50 Ext.Net.InitScriptFilter.Flush() +74 System.Web.HttpWriter.Filter(Boolean finalFiltering) +8782518 System.Web.HttpResponse.FilterOutput() +82 System.Web.CallFilterExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +47 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75
出现这个问题可能是由于创建控件没有添加到控件库中，如下：
protected override void CreateChildControls()
{
Viewport viewMain = new Viewport(); viewMain.ID = this.ID + "_viewMain"; viewMain.Layout = "AnchorLayout"; viewMain.AutoScroll = true; viewMain.Border = false; viewMain.BorderSpec = "0 0 0 0"; this.Controls.Add(viewMain); //少了这条语句就会出现上述错误提示
}
主要原因是控件ID重复。
6、Ext.Net扩展自定义控件，保存自定义属性状态：
public class TextFieldState : Ext.Net.Panel { private TextField referText; private Ext.Net.Panel referPanel; private string _text; private string _selectText; public virtual string Text { get { _text = ViewState["Text"].ToString(); return _text; } set { _text = value; ViewState["Text"] = _text; if (referText != null) referText.Text = _text; } } [Bindable(true)] [Localizable(true)] public string SelectText { get { _selectText = ViewState["SelectText"].ToString(); return _selectText; } set { _selectText = value; ViewState["SelectText"] = _selectText; } }
<ext:ResourceManager ID="ResourceManager1" runat="server" DisableViewState="false" /> //页面中需要更新属性DisableViewState="false"
在使用控件时，操作如下：
public partial class WebForm4 : System.Web.UI.Page { protected TextFieldState txtFState; protected void Page_Init(object sender, EventArgs e) { txtFState = new TextFieldState(); txtFState.ID = "txtFState"; this.form1.Controls.Add(txtFState); Ext.Net.Button btn = new Ext.Net.Button(); btn.Text = "Set"; btn.DirectEvents.Click.ViewStateMode = ViewStateMode.Enabled; //必须启用ViewState btn.DirectClick += new Ext.Net.ComponentDirectEvent.DirectEventHandler(btnSet_DirectClick); this.form1.Controls.Add(btn); btn = new Ext.Net.Button(); btn.Text = "Show"; //必须启用ViewState
btn.DirectEvents.Click.ViewStateMode = ViewStateMode.Enabled; btn.DirectClick += new Ext.Net.ComponentDirectEvent.DirectEventHandler(btn_DirectClick); btn.EnableViewState = true; this.form1.Controls.Add(btn); } void btnSet_DirectClick(object sender, Ext.Net.DirectEventArgs e) { txtFState.Text = "ddddfdfd"; txtFState.SelectText = "aaaaaa"; } void btn_DirectClick(object sender, Ext.Net.DirectEventArgs e) { X.Msg.Alert("提示", txtFState.Text + "|" + txtFState.SelectText).Show(); } }
执行的效果图如下：
7、在导出Excel时出现“由于出现错误 c00ce514 而导致此项操作无法完成”的解决方法：
如果是通过点击Ext.net按钮导出，则需要设置如下属性：
ButtonID.DirectEvents.Click.IsUpload = true;
如果是通过JavaScript方式通过调用DirectMethod来导出，则在调用方法时加入：“{ isUpload: true }”，如下：
App.direct.ExportData({ isUpload: true });