How asp.net MVC4 enumerates to generate DropDownList
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In MVC development, we often use enumerated types, usually enumerated types are used in DropDownList, each conversion is not a good way. This function is achieved by extension.
The code is as follows:
Public static class ExSelectListItem
{
Public static List ToSelectListItem (this Enum valueEnum)
{
Return (from int value in Enum.GetValues (valueEnum.GetType ()
Select new SelectListItem
{
Text = Enum.GetName (valueEnum.GetType (), value)
Value = value.ToString ()
}) .ToList ()
}
Public static List ToSelectListItem (this Enum valueEnum, string selectName)
{
Return (from int value in Enum.GetValues (valueEnum.GetType ()
Select new SelectListItem
{
Text = Enum.GetName (valueEnum.GetType (), value)
Value = Enum.GetName (valueEnum.GetType (), value)
Selected = Enum.GetName (valueEnum.GetType (), value) = = selectName? True: false
}) .ToList ()
}
}
We extend the Enum method to automatically convert the application of List in the foreground of MVC.
Use at the front desk:
@ Html.DorpDownList ((List) TempData ["enumerated types"])
It will work.
Background code application:
TempData [enumerated types] = ((Enum) enumerated types. Default type) .ToSelectListItem ()
In the extension to the second method, we pass the enumeration type name to determine whether the state is selected.
TempData [enumerated types] = ((Enum) enumerated types. Default type) .ToSelectListItem (default type)
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