以下是我根据其他答案得出的结论。把错误处理弄得这么具体，有点过分了。

public static T GetPropertyValue<T>(object sourceInstance, string targetPropertyName, bool throwExceptionIfNotExists = false)
{
    string errorMsg = null;

    try
    {
        if (sourceInstance == null || string.IsNullOrWhiteSpace(targetPropertyName))
        {
            errorMsg = $"Source object is null or property name is null or whitespace. '{targetPropertyName}'";
            Log.Warn(errorMsg);

            if (throwExceptionIfNotExists)
                throw new ArgumentException(errorMsg);
            else
                return default(T);
        }

        Type returnType = typeof(T);
        Type sourceType = sourceInstance.GetType();

        PropertyInfo propertyInfo = sourceType.GetProperty(targetPropertyName, returnType);
        if (propertyInfo == null)
        {
            errorMsg = $"Property name '{targetPropertyName}' of type '{returnType}' not found for source object of type '{sourceType}'";
            Log.Warn(errorMsg);

            if (throwExceptionIfNotExists)
                throw new ArgumentException(errorMsg);
            else
                return default(T);
        }

        return (T)propertyInfo.GetValue(sourceInstance, null);
    }
    catch(Exception ex)
    {
        errorMsg = $"Problem getting property name '{targetPropertyName}' from source instance.";
        Log.Error(errorMsg, ex);

        if (throwExceptionIfNotExists)
            throw;
    }

    return default(T);
}

jheddings和AlexD都写了关于如何解析属性字符串的出色答案。我想把我的库也加入其中，因为我专门为此编写了一个库。

路径。CSharp的主类是Resolver。默认情况下，它可以解析属性、数组和字典条目。

举个例子，如果你有一个这样的物体

var o = new { Property1 = new { Property2 = "value" } };

想要获得Property2，你可以这样做:

IResolver resolver = new Resolver();
var path = "Property1.Property2";
object result = r.Resolve(o, path); 
//=> "value"

这是它可以解析的路径的最基本示例。如果你想看看它还能做什么，或者你可以如何扩展它，只需前往它的Github页面。

在. net Standard中调用的方法已经改变(从1.6开始)。我们还可以使用c# 6的空条件操作符。

using System.Reflection; 
public static object GetPropValue(object src, string propName)
{
    return src.GetType().GetRuntimeProperty(propName)?.GetValue(src);
}

看看Heleonix。反映图书馆。你可以通过路径获取/设置/调用成员，或者创建一个getter/setter (lambda编译成委托)，这比反射更快。例如:

var success = Reflector.Get(DateTime.Now, null, "Date.Year", out int value);

或者只创建一个getter并缓存以供重用(这样性能更好，但如果中间成员为空可能会抛出NullReferenceException):

var getter = Reflector.CreateGetter<DateTime, int>("Date.Year", typeof(DateTime));
getter(DateTime.Now);

或者如果你想创建一个List<Action<object, object>>的不同getter，只需要为已编译的委托指定基本类型(类型转换将被添加到已编译的lambdas中):

var getter = Reflector.CreateGetter<object, object>("Date.Year", typeof(DateTime));
getter(DateTime.Now);

jheddings的回答很好。我想通过允许引用聚集的数组或对象的集合来改进它，这样propertyName可以是property1.property2[X].property3:

    public static object GetPropertyValue(object srcobj, string propertyName)
    {
        if (srcobj == null)
            return null;

        object obj = srcobj;

        // Split property name to parts (propertyName could be hierarchical, like obj.subobj.subobj.property
        string[] propertyNameParts = propertyName.Split('.');

        foreach (string propertyNamePart in propertyNameParts)
        {
            if (obj == null)    return null;

            // propertyNamePart could contain reference to specific 
            // element (by index) inside a collection
            if (!propertyNamePart.Contains("["))
            {
                PropertyInfo pi = obj.GetType().GetProperty(propertyNamePart);
                if (pi == null) return null;
                obj = pi.GetValue(obj, null);
            }
            else
            {   // propertyNamePart is areference to specific element 
                // (by index) inside a collection
                // like AggregatedCollection[123]
                //   get collection name and element index
                int indexStart = propertyNamePart.IndexOf("[")+1;
                string collectionPropertyName = propertyNamePart.Substring(0, indexStart-1);
                int collectionElementIndex = Int32.Parse(propertyNamePart.Substring(indexStart, propertyNamePart.Length-indexStart-1));
                //   get collection object
                PropertyInfo pi = obj.GetType().GetProperty(collectionPropertyName);
                if (pi == null) return null;
                object unknownCollection = pi.GetValue(obj, null);
                //   try to process the collection as array
                if (unknownCollection.GetType().IsArray)
                {
                    object[] collectionAsArray = unknownCollection as object[];
                    obj = collectionAsArray[collectionElementIndex];
                }
                else
                {
                    //   try to process the collection as IList
                    System.Collections.IList collectionAsList = unknownCollection as System.Collections.IList;
                    if (collectionAsList != null)
                    {
                        obj = collectionAsList[collectionElementIndex];
                    }
                    else
                    {
                        // ??? Unsupported collection type
                    }
                }
            }
        }

        return obj;
    }

使用微软的CallByName怎么样?VisualBasic命名空间(Microsoft.VisualBasic.dll)?它使用反射来获取普通对象、COM对象甚至动态对象的属性、字段和方法。

using Microsoft.VisualBasic;
using Microsoft.VisualBasic.CompilerServices;

然后

Versioned.CallByName(this, "method/function/prop name", CallType.Get).ToString();