在下拉列表中显示属性名称
本文关键字:属性 显示 下拉列表 | 更新日期: 2023-09-27 18:29:07
假设我有这个:
public class Languages
{
public string Language;
public string SpokenAbility;
public string WrittenAbility;
}
有没有办法将其加载到下拉列表中,以便下拉列表显示以下项目:Language、SpokenAbility和WrittenAbility?
// using System.Reflection;
// using System.Linq;
IEnumerable<String> properties = typeof(Languages)
.GetProperties(BindingFlags.Public | BindingFlags.Instance)
.Select(x => x.Name);
您可以使用反射来获取属性,并使用LINQ使其更容易。
正如Spontifixus所指出的,您正在使用字段。所有需要切换的是.GetProperties
到.GetFields
:
IEnumerable<String> fields = typeof(Languages)
.GetFields(BindingFlags.Public | BindingFlags.Instance)
.Select(x => x.Name);
让它更容易的扩展方法:
public static class FieldAndPropertyExtensions
{
/*
* Field Methods
*/
public static IEnumerable<String> GetFields<T>(this T obj, Boolean includeInheritedFields = true) where T : class
{
return getFieldsFor<T>(includeInheritedFields).Select(x => x.Name);
}
public static IEnumerable<String> GetFieldsFor<T>(Boolean includeInheritedFields = true) where T : class
{
return getFieldsFor<T>(includeInheritedFields).Select(x => x.Name);
}
public static IDictionary<String, Object> GetFieldValueDictionary<T>(this T obj, Boolean includeInheritedFields = true) where T : class
{
IEnumerable<FieldInfo> fields = getFieldsFor<T>(includeInheritedFields);
IDictionary<String, Object> result = new Dictionary<String, Object>();
foreach (var field in fields)
{
result.Add(field.Name, field.GetValue(obj));
}
return result;
}
/*
* Property Methods
*/
public static IEnumerable<String> GetProperties<T>(this T obj, Boolean includeInheritedProperties = true) where T : class
{
return getPropertiesFor<T>(includeInheritedProperties).Select(x => x.Name);
}
public static IEnumerable<String> GetPropertiesFor<T>(Boolean includeInheritedProperties = true) where T : class
{
return getPropertiesFor<T>(includeInheritedProperties).Select(x => x.Name);
}
public static IDictionary<String, Object> GetPropertyValueDictionary<T>(this T obj, Boolean includeInheritedProperties = true) where T : class
{
IEnumerable<PropertyInfo> properties = getPropertiesFor<T>(includeInheritedProperties);
IDictionary<String, Object> result = new Dictionary<String, Object>();
foreach (var property in properties)
{
result.Add(property.Name, property.GetValue(obj));
}
return result;
}
/*
* Helper methods
*/
private static IEnumerable<FieldInfo> getFieldsFor<T>(Boolean includeInheritedFields = true) where T : class
{
return typeof(T)
.GetFields(BindingFlags.Public | BindingFlags.Instance)
.Where(x => includeInheritedFields || x.DeclaringType == typeof(T));
}
private static IEnumerable<PropertyInfo> getPropertiesFor<T>(Boolean includeInheritedFields = true) where T : class
{
return typeof(T)
.GetProperties(BindingFlags.Public | BindingFlags.Instance)
.Where(x => includeInheritedFields || x.DeclaringType == typeof(T));
}
}
示例用法:
// instance methods:
var languages = new Languages();
var properties = languages.GetProperties(); // prop1,prop2,prop3
var fields = languages.GetFields(); // field1,field2,field3
var propAndValue = languages.GetPropertyValueDictionary(); // Dict<propertyName,value>
var fieldAndValue = languages.GetFieldValueDictionary(); // Dict<fieldName,value>
// non-instance methods:
var properties = ObjectExtensions.GetPropertiesFor<Languages>(); // prop1,prop2,prop3
var fields = ObjectExtensions.GetFieldsFor<Languages>(); // field1,field2,field3
首先,您需要确保您的类具有属性。问题中定义的是字段。要将它们转换为属性,只需添加get;
和set;
方法:
public class Languages
{
public string Language { get; set; }
public string SpokenAbility { get; set; }
public string WrittenAbility {get; set; }
}
然后您可以使用以下代码列出属性:
var properties = typeof(Languages).GetProperties().Select(p => p.Name)
要检索属性的值,请使用以下代码:
var language = new Languages(){ Language="German" };
var result = typeof(Languages).GetProperty("Language").GetValue(language);