Dropdownlist选择的值会自动更改 [英] Dropdownlist selected value is getting changed automatically

问题描述

我有一个下拉列表，如果我选择一个值，它将被更改为另一个值（仅在某些情况下），我观察到的是DataValueField值对于两者都是相同的，但DataTextField值是不同的。

dtCurrency有两列 - 短代码和长名称。

I have a drop-down list, if I am selecting one value it is getting changed to another (only in some cases), what I have observed is DataValueField value is same for both but DataTextField value is different.
dtCurrency has two columns - shortcode and Long Name.

ddlCurrency.DataSource = dtCurrency;
        ddlCurrency.DataTextField = "shortcode";
        ddlCurrency.DataValueField = "Long Name";
        ddlCurrency.DataBind();
        ddlCurrency.Items.Insert(0, "Currency");

例如：

我选择TRY它会自动更改为TRL，

相同的BGN到BGL正在改变。



dtCurrency：

Example:
I m selecting TRY it is changing to TRL automatically,
same for BGN to BGL is changing.

dtCurrency:

shortcode	Long Name
BGL	Bulgarian Lev
BGN	Bulgarian Lev
TRL	Turkish Lira
TRY	Turkish Lira
INR     Indian Rupees
USD     US Dollors

我尝试过：



仅当DataValueField相同时才会发生这种情况。如何解决这个问题。

What I have tried:

This is happening only when DataValueField is same. how to resolve this.

推荐答案

对于Dropdownlist，数据值字段应该有不同的值。仍然，该选项可用于当前的情况是：



给出字段，文本和值的shortCode，并根据选定的索引数据可以从数据表。

For Dropdownlist, there should be distinct values for the data value field. Still, the option can be used for the current situation is:

Give shortCode for both field, text and value and based on selected index data can be fetched out from the data table.

Quote：

仅当DataValueField相同时才会发生这种情况。如何解决这个问题。

This is happening only when DataValueField is same. how to resolve this.

这是DropDownList的正常行为。



正如其他人提到的那样，你的 DropDownList DataValueField c> 必须是唯一的，以便选择不会搞砸。要解决此问题，请使用短代码字段作为 DataValueField 。例如：

That's a normal behavior of the DropDownList.

As others have mentioned, the DataValueField for your DropDownList must be unique so that the selection won't messed up. To fix that, use the shortcode field as the DataValueField. For example:

ddlCurrency.DataSource = dtCurrency;
ddlCurrency.DataTextField = "shortcode";
ddlCurrency.DataValueField = "shortcode";
ddlCurrency.DataBind();
ddlCurrency.Items.Insert(0, "Currency");

现在，如果你真的想显示长名在页面中的字段，然后您可以组合两个字段并将其显示为一个。这真的取决于你。同样，这里的基本思想是使你的 DataValueField 值必须是唯一的，并且没有重复的值。

Now if you really want to display the Long Name field in the page then you can combine both fields and display it as one. That really depends on you. Again, the basic idea here is to make that your DataValueField values must be unique and doesn't have duplicate values.

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