如何使用反射从FieldInfo获取System.Collections.Generic.List？

首先获取类型中的FieldInfo对象：

FieldInfo fieldInfo = typeof(SomeCl as s).GetField("listField", BindingFlags.Instance | BindingFlags.NonPublic);

然后获取该FieldInfo所属的类型：

Type fieldType = fieldInfo.FieldType;

判断该类型是否为List类型：

if(typeof(List<>).Is As signableFrom(fieldType.GetGenericTypeDefinition()))

如果是List类型，则使用反射创建List对象并将其赋值给FieldInfo：

object listObject = Activator.CreateInstance(fieldType); fieldInfo.SetValue(someCl as sInstance, listObject);

完整代码示例：

using System; using System.Collections.Generic; using System.Reflection;

public cl as s SomeCl as s private List<int> listField = new List<int>();

public cl as s Program public static void Main() SomeCl as s someCl as sInstance = new SomeCl as s();

    // 获取SomeClass类中名为listField的私有字段
    FieldInfo fieldInfo = typeof(SomeClass).GetField("listField", BindingFlags.Instance | BindingFlags.NonPublic);
    // 获取listField字段的类型
    Type fieldType = fieldInfo.FieldType;
    // 判断类型是否为List<int>
    if(typeof(List<>).IsAssignableFrom(fieldType.GetGenericTypeDefinition()))
        // 使用反射创建List<int>对象并将其赋值给listField字段
        object listObject = Activator.CreateInstance(fieldType);
        fieldInfo.SetValue(someClassInstance, listObject);
        // 测试是否成功
        List<int> listPropertyValue = (List<int>)fieldInfo.GetValue(someClassInstance);
        listPropertyValue.Add(1);
        Console.WriteLine(listPropertyValue[0]);