公共属性列表及其值[重复]
Posted
技术标签:
【中文标题】公共属性列表及其值[重复]【英文标题】:List of public Properties and their values [duplicate] 【发布时间】:2014-02-12 22:00:49 【问题描述】:.Net 4.5 C#
要支持许多类的“导出到 Excel”功能,我需要能够获取一个类,然后从中获取公共属性名称(用于标题)和属性值(用于行)
有没有办法反映类的实例并获取属性名称和属性值?
【问题讨论】:
【参考方案1】:实际上,我最近为我的工作创建了类似的东西。我正在编写一个自定义 CSV 序列化程序类来支持一个考虑不周的 CSV 文件规范。
public CSVSerializer Serialize<T>(T data, Func<T, object> map)
if (map == null) throw new ArgumentNullException("map");
object mappedData = map(data);
if (mappedData == null) throw new NullReferenceException("Mapped data produced null value");
// Iterate over public members of `mappedData`
MemberInfo[] members = mappedData.GetType().GetMembers(BindingFlags.Instance | BindingFlags.Public);
List<string> values = new List<string>();
foreach (MemberInfo member in members)
// Skip events and methods
if (!(member is FieldInfo || member is PropertyInfo)) continue;
// Value of `mappedData`
object memberVal = MemberInfoValue(member, mappedData);
if (memberVal == null)
// If the actual value stored by `memberVal` is null, store string.Empty and continue
values.Add(string.Empty);
continue;
// Check if `memberVal` contains a member named "map"
MemberInfo[] maps = memberVal.GetType().GetMember("map");
MemberInfo memberMap = maps.Length > 0 ? maps[0] : null;
string val = MapToString(memberVal, o => o.ToString());
if (map != null) // map is present
// Get first property other than map
MemberInfo dataVal = memberVal.GetType().GetMembers(BindingFlags.Instance | BindingFlags.Public)
.Where(mi => mi is FieldInfo || mi is PropertyInfo)
.Except(new MemberInfo[] memberMap )
.DefaultIfEmpty(memberMap)
.FirstOrDefault();
object tmp = MemberInfoValue(memberMap, memberVal);
if (dataVal == memberMap)
// map is only property, so serialize it
val = MapToString(tmp, o => o.ToString());
else
// try to serialize map(dataVal), or use empty string if it fails
Delegate dlg = tmp as Delegate;
if (dlg != null)
object param = MemberInfoValue(dataVal, memberVal);
try val = MapToString(dlg, d => d.DynamicInvoke(param).ToString());
catch (Exception ex)
// exception should only occur with parameter count/type mismatch
throw new SerializationException(string.Format("Poorly formatted map function in 0", member.Name), ex);
else
// map is not a delegate (!!)
throw new SerializationException(string.Format("map member in 0 is not a delegate type", member.Name));
// Handle quotes and the separator string
val = val.Trim('"');
if (val.Contains("\""))
val = val.Replace("\"", "\\\"");
if (val.Contains(Separator))
val = string.Format("\"0\"", val);
values.Add(val);
string line = string.Join(Separator, values);
Writer.WriteLine(line);
return this;
此函数按定义的顺序序列化data
的公共字段和属性;这些成员的名字将被忽略。
如果您只对属性感兴趣,可以使用GetProperties
代替GetMembers
(使用PropertyInfo
代替MemberInfo
)。如果您不创建 CSV,则显然可以忽略 CSV 文件格式部分。
MemberInfoValue(info, parent)
返回 ((FieldInfo)info).GetValue(parent)
或 ((PropertyInfo)info).GetValue(parent, null)
,视情况而定。 MapToString
只是一个空保护函数。
map
参数的存在和寻找名为“map”的成员是我特定情况的必需品的一部分,尽管它可能对您有用。映射允许以下内容:
mySerializer.Serialize(myPersonObject,
p => new
name = string.Format("0, 1", p.LastName, p.FirstName),
address = p.address
);
我有一个Serialize
的重载,它调用Serialize(data, d => d);
。寻找“地图”成员允许这样的事情:
mySerializer.Serialize(new
employeeID = new val = myEmployeeObject.ID, map = d => d.ToUpperCase() ,
employeeName = myEmployeeObject.Name
);
【讨论】:
【参考方案2】:你可以这样使用:
public static Dictionary<string, object> KeyValue(object obj)
return obj.GetType().GetProperties().ToDictionary(
m => m.Name,
m => m.GetValue(obj, new object[] )
);
【讨论】:
【参考方案3】:这里有一个关于如何做到这一点的快速示例。当然,您需要对其进行更新,以便正确创建/构造 CSV,但这让您了解如何获得所需的值。
class Program
static void Main(string[] args)
var myClass = new MyClass()
Number = 1,
String = "test"
;
var properties = myClass.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance);
foreach (var property in properties)
var columnName = property.Name;
var value = myClass.GetType().GetProperty(columnName).GetValue(myClass, null);
Console.WriteLine(string.Format("0 - 1", columnName, value));
Console.ReadKey();
public class MyClass
public int Number get; set;
public string String get; set;
【讨论】:
以上是关于公共属性列表及其值[重复]的主要内容,如果未能解决你的问题,请参考以下文章