什么是绑定到字符串数组的gridview的dataKeyName？ [英] What is the dataKeyName for a gridview bound to a string array?

问题描述

任何人都可以给我一个简短的代码片断，给出一个最初绑定到一个简单的字符串数组的GridView，并给出一个GridViewRow行，将返回绑定到该行的值？

解决方案

你不能，唯一的属性System.String有Length，并且DataKeyName需要你有的对象属性绑定到。要回答第二个问题，下面是从GridViewRow获取字符串值的示例。

在您的ASPX文件中：

 < asp：GridView ID =GridView1runat =server
 OnRowDataBound =GridView1_RowDataBoundAutoGenerateColumns =false> 
<列> 
< asp：TemplateField HeaderText =String Value> 
< ItemTemplate> 
<％＃Container.DataItem％> 
< / ItemTemplate> 
< / asp：TemplateField> 
< /列> 
< / asp：GridView> 
  

在您的代码隐藏中：

  protected void Page_Load（object sender，EventArgs e）{
 string [] arrayOfStrings = new string [] {first，second，third}; 
 GridView1.DataSource = arrayOfStrings; 
 GridView1.DataBind（）; 
} 
 
 protected void GridView1_RowDataBound（object sender，GridViewRowEventArgs e）{
 if（e.RowType == DataControlRowType.DataRow）{
 // e。 Row的类型为GridViewRow 
 // e.Row.DataItem包含被绑定的原始值，
 //但它是对象类型的，因此您需要将其转换为字符串。 
字符串值=（字符串）e.Row.DataItem; 
 
 
 
 
 $ b $ p 
 $ b 
解决此问题的唯一合理解决方法是创建一个包含属性的包装类。或者，如果您使用的是.NET 3.5，则可以使用LINQ创建一个临时列表，其中只包含您的值作为类的属性。有一个的例子此技巧在MSDN论坛上 vtcoder 。
 列表< string> names = new List< string>（new string [] {John，Frank，Bob}）; 
 
 var bindableNames =从名字中的名字
选择new {Names = name}; 
 
 GridView1.DataSource = bindableNames.ToList（）; 
  
然后Name就是DataKeyName和BoundField DataField。
 
Can anyone give me a short snippet that, given a GridView that was originally bound to a simple string array, and given a GridViewRow row, will return the value that was bound to the row?  
解决方案
You can't, the only property System.String has is Length, and DataKeyName expects a property of the object you are binding to. To answer your second question, here is an example of getting the string value from a GridViewRow.

In your ASPX file:
<asp:GridView ID="GridView1" runat="server"
    OnRowDataBound="GridView1_RowDataBound" AutoGenerateColumns="false">
    <Columns>
        <asp:TemplateField HeaderText="String Value">
            <ItemTemplate>
                <%# Container.DataItem %>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>
In your codebehind:
protected void Page_Load(object sender, EventArgs e) {
    string[] arrayOfStrings = new string[] { "first", "second", "third" };
    GridView1.DataSource = arrayOfStrings;
    GridView1.DataBind();
}

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e) {
    if (e.Row.RowType == DataControlRowType.DataRow) {
        // e.Row is of type GridViewRow
        // e.Row.DataItem contains the original value that was bound,
        // but it is of type object so you'll need to cast it to a string.
        string value = (string)e.Row.DataItem;
    }
}
The only reasonable workaround to the problem is to either create a wrapper class that has properties. Or if you are using .NET 3.5, you can use LINQ to make a temporary list which only includes your value as a property of the class. There is an example of this technique on MSDN Forums by vtcoder.
List<string> names = new List<string>(new string[] { "John", "Frank", "Bob" });

var bindableNames = from name in names
                    select new {Names=name};

GridView1.DataSource = bindableNames.ToList();
Then "Name" would be the DataKeyName and BoundField DataField.

                        
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