属性selecteditem只是radiobuttonlist的readonly [英] Property selecteditem is readonly for radiobuttonlist

问题描述

我有错误属性selectitem是readonly当我动态创建这样的单选按钮列表：

  Dim  DDL  As  新 DropDownList 
  Dim  RBL  As  新 RadioButtonList 
  Dim  CBL 作为 新 CheckBoxList 
 
 DDL.ID =   DDL _& SelectedCategory&   _& SubAssy&   _& ProductType 
 RBL.ID =   RBL _& SelectedCategory&   _& SubAssy&   _& ProductType 
 CBL.ID =   CBL _& SelectedCategory&   _& SubAssy&   _& ProductType 
 
 如果 ProductType =  常规 或（CategorySelected =   KC 2.1（没有织带的卷收器） 和 ProductType =   KC2.1 或 ProductType =   Webbing）或 
（CategorySelected =   KC 2.1安全带） 和 ProductType =  < span class =code-string> KC2.1）然后 
 
 DDL.Visible =  False  
 RBL.Visible =  Fals e  
 CBL.Visible =  False  
 
 DDL.SelectedItem =  True  
 RBL.SelectedItem =  True  
 CBL.SelectedItem =  True  
 
 结束 如果 

在以下3行代码中：

 DDL.SelectedItem =  True  
 RBL.SelectedItem =  True  
 CBL.SelectedItem =  True  

显示错误。我必须使用RadioButtonList或DropDownList或CheckBoxList创建一个用户选择项目的表，但我希望某个按钮具有预先选择的值并且不显示。当我阅读所有选中的按钮时，我希望这样。



我尝试过：



我尝试不在我的表格中显示，但我希望在我选择时将其选中

解决方案

文档说明SelectedItem [ ^ ]

Quote：

获取列表控件中索引最低的所选项目。

如果要以编程方式设置所选项目，则需要使用 SelectedIndex [ ^ ]属性

Quote：

获取或设置列表中所选项目的最低序号索引。

您使用的值 True 表示您正在尝试访问控制列表的特定成员，在这种情况下，您需要指定哪一个。如果您正在尝试这样做，您可能会发现此链接很有用 c＃ - 以编程方式检查复选框列表中的项目，其中文本等于我想要的内容 - Stack Overflow [ ^ ]（这是在C＃但原则是相同的）或这一个保存用户&＃CheckBoxList选项并从保存的数据中重新填充CheckBoxList [ ^ ]

I have the error Property selecteditem is readonly when I dynamically create a radio button list like this:

Dim DDL As New DropDownList
Dim RBL As New RadioButtonList
Dim CBL As New CheckBoxList

DDL.ID = "DDL_" & SelectedCategory & "_" & SubAssy & "_" & ProductType
RBL.ID = "RBL_" & SelectedCategory & "_" & SubAssy & "_" & ProductType
CBL.ID = "CBL_" & SelectedCategory & "_" & SubAssy & "_" & ProductType

If ProductType = "General" Or (CategorySelected = "KC 2.1 (retractor without webbing)" And ProductType = "KC2.1" Or ProductType = "Webbing") Or
(CategorySelected = "KC 2.1 Seatbelt)" And ProductType = "KC2.1") Then

    DDL.Visible = False
    RBL.Visible = False
    CBL.Visible = False

    DDL.SelectedItem = True
    RBL.SelectedItem = True
    CBL.SelectedItem = True

End If

On these 3 lines of code:

DDL.SelectedItem = True
RBL.SelectedItem = True
CBL.SelectedItem = True

the error is displayed. I have to create a table with RadioButtonList or DropDownList or CheckBoxList where the user select items, but I want some button to have a pre-selected value and doesn't display. I want that for when I read all buttons selected.

What I have tried:

I try to not display in my table, but i want to be selected for when i red them

解决方案

The documentation states that SelectedItem[^]

Quote:

Gets the selected item with the lowest index in the list control.

If you want to programmatically set the selected item you need to use the SelectedIndex[^] property which

Quote:

Gets or sets the lowest ordinal index of the selected items in the list.

The fact that you are using values of True implies that you are trying to access a specific member of the control list, in which case you need to specify which one. You might find this link useful if that is what you are trying to do c# - Programatically Check an Item in Checkboxlist where text is equal to what i want - Stack Overflow[^] (It's in C# but the principles are the same) or this one Saving a user's CheckBoxList selection and re-populating the CheckBoxList from saved data[^]

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