如何将枚举值分配给Compact Framework中的.NET 1.1中的列表框？ [英] How can I assign enum values to a listbox in .NET 1.1 on the Compact Framework?

问题描述

从 http://weblogs.asp.net/stevewellens/archive/2009/08/19/how-to-fill-a-listbox-dropdownlist-from-an-enum.aspx ，I请参阅将枚举值分配给列表框的示例：

From http://weblogs.asp.net/stevewellens/archive/2009/08/19/how-to-fill-a-listbox-dropdownlist-from-an-enum.aspx, I see this example for assigning enum values to a listbox:

Array Values = System.Enum.GetValues(EnumType);

foreach (int Value in Values)
{
    string Display = Enum.GetName(EnumType, Value);
    ListItem Item = new ListItem(Display, Value.ToString());
    TheListBox.Items.Add(Item);
}

但是，在我的Windows CE项目（.NET 1.1）中，没有System.Enum.GetValues（）;有GetUnderlyingType和ToObject...

However, in my Windows CE project (.NET 1.1), there is no "System.Enum.GetValues()"; there is "GetUnderlyingType" and "ToObject"...

这是实现这一点的关键之一吗？

Is one of those the key to accomplishing this?

尝试实现Jon Skeet的代码时，ListItem声明将失败，无法找到类型或命名空间名称ListItem（您是否缺少一个使用指令或程序集引用？）

Trying to implement Jon Skeet's code, the "ListItem" declaration fails with "The type or namespace name 'ListItem' could not be found (are you missing a using directive or an assembly reference?)"

我正在使用OpenNETCF。所以，VS提供添加OpenNETCF.Windows.Forms.ListItem到我的使用块。但是当我这样做时，它会抱怨同一行的构造器部分（ListItem item = new ListItem（field.Name，value.ToString（））;）与：最好的重载方法匹配'OpenNETCF.Windows.Forms .ListItem.ListItem（string，int）'有一些无效的参数

I am using OpenNETCF. So, VS offers to add "OpenNETCF.Windows.Forms.ListItem" to my using block. But when I do, it then complains on the constructor part of that same line (ListItem item = new ListItem(field.Name, value.ToString());) with: "The best overloaded method match for 'OpenNETCF.Windows.Forms.ListItem.ListItem(string, int)' has some invalid arguments"

现在整个处理程序是：

private void PrinterPickerForm_Load(object sender, System.EventArgs e)
{
    // Got this from Jon Skeet (http://stackoverflow.com/questions/17952900/how-can-i-assign-enum-values-to-a-listbox-in-net-1-1)
    Type type = typeof(PrintUtils.BeltPrinterType);
    foreach (FieldInfo field in type.GetFields(BindingFlags.Static | BindingFlags.Public))
    {
        // Fortunately unboxing to the enum's underlying field type works
        int value = (int) field.GetValue(null);
        ListItem item = new ListItem(field.Name, value.ToString());
        listBoxBeltPrinters.Items.Add(item);
    }
}

更新2

这样做：

UPDATE 2

This works:

private void PrinterPickerForm_Load(object sender, System.EventArgs e)
{
    Type type = typeof(PrintUtils.BeltPrinterType);
    foreach (FieldInfo field in type.GetFields(BindingFlags.Static | BindingFlags.Public))
    {
        string display = field.GetValue(null).ToString();
        listBoxBeltPrinters.Items.Add(display);
    }
}

确实，枚举本身没有填充列表框，只是代表他们的字符串，但没关系，因为我必须使用kludgy方式分配值：

It's true that the enums themselves are not populating the listboxes, just the strings that represent them, but that's okay, because I have to use a kludgy way to assign the value, too:

private void listBoxBeltPrinters_SelectedIndexChanged(object sender, System.EventArgs e)
{
    //Tried to do something more "el[egant,oquent]" but .NET 1.1 seems to be holding me back
    // http://stackoverflow.com/questions/17953173/how-can-i-assign-the-value-selected-in-a-listbox-to-an-enum-var/17953297?noredirect=1#17953297
    string sel = listBoxBeltPrinters.SelectedItem.ToString();
    if (sel == "Zebra QL220")
    {
        PrintUtils.printerChoice = PrintUtils.BeltPrinterType.ZebraQL220;
    }
    else if (sel == "ONiel")
    {
        PrintUtils.printerChoice = PrintUtils.BeltPrinterType.ONiel;
    }
    //else if ( . . .)
}

推荐答案

自从使用Compact Framework以来，已经很久了，但我怀疑最简单的方法只是获取字段值，并将它们存储在某个地方： p>

It's been a long time since I've used the Compact Framework, but I suspect the simplest approach is just to get the field values - and store them somewhere, of course:

Type type = typeof(EnumType);
foreach (FieldInfo field in type.GetFields(BindingFlags.Static |
                                           BindingFlags.Public))
{
    // Fortunately unboxing to the enum's underlying field type works
    int value = (int) field.GetValue(null);
    ListItem item = new ListItem(field.Name, value.ToString());
    TheListBox.Items.Add(item);
}

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