最近在做配置模块，然后整个配置的参数是非常多的，层级结构也很深。可能有几百个参数，三、四层的层级关系，想要捋顺所有的类和参数，太繁琐了，而且 Visual Studio 的类视图只能看到属性，却看不出层级关系来，所以花费些许精力，写一个控制台小程序，展示类结构。原理就是通过反射得到所有属性，遍历展示，有层级关系的递归展示。

代码如下：

public static void PrintProperties(object obj, int indentLevel, ref StringBuilder sb)
{
    try
    {
        // 堆代码 duidaima.com
        var type = obj.GetType();
        var properties = type.GetProperties(BindingFlags.Public | BindingFlags.Instance);
        foreach (var property in properties)
        {
            string[] arr = newstring[] { "", "", "" };

            if (property.PropertyType.IsClass && property.PropertyType != typeof(string))
            {
                varvalue = property.GetValue(obj);

                if (value == null)
                {
                    value = Activator.CreateInstance(property.PropertyType);
                }
                // 判断属性的类型是否为泛型类型
                if (property.PropertyType.IsGenericType)
                {

                    // 获取属性的泛型类型定义
                    var typeDefinition = property.PropertyType.GetGenericTypeDefinition();

                    Type[] typeArgs = value.GetType().GetGenericArguments();

                    var temp = Activator.CreateInstance(typeArgs[0]);

                    // 判断泛型类型是否为 IEnumerable<T>
                    if (typeDefinition == typeof(IEnumerable<>))
                    {
                        arr[0] = "IEnumerable<";
                        arr[1] = typeArgs[0].Name;
                        arr[2] = "> ";
                    }
                    elseif (typeDefinition == typeof(List<>))
                    {
                        arr[0] = "List<";
                        arr[1] = typeArgs[0].Name;
                        arr[2] = "> ";
                    }

                    // 判断泛型类型是否为 ICollection<T>
                    elseif (typeDefinition == typeof(ICollection<>))
                    {
                        arr[0] = "ICollection<";
                        arr[1] = typeArgs[0].Name;
                        arr[2] = "> ";
                    }
                    elseif (typeDefinition == typeof(Dictionary<,>))
                    {
                        arr[0] = "Dictionary<";
                        arr[1] = string.Join(",", typeArgs.Select(t => t.Name));
                        arr[2] = "> ";

                    }

                    sb.Append(newstring(' ', indentLevel * 4));
                    sb.AppendLine("- " + string.Join("", arr) + property.Name);

                    PrintProperties(temp, indentLevel + 1, ref sb);
                }
                else
                {
                    arr[0] = "";
                    arr[1] = property.PropertyType.Name;
                    arr[2] = " ";

                    sb.Append(newstring(' ', indentLevel * 4));
                    sb.AppendLine("- " + string.Join("", arr) + property.Name);

                    PrintProperties(value, indentLevel + 1, ref sb);
                }
            }
            else
            {
                arr[0] = "";
                arr[1] = property.PropertyType.Name;
                arr[2] = " ";

                sb.Append(newstring(' ', indentLevel * 4));
                sb.AppendLine("- " + string.Join("", arr) + property.Name);
            }
        }
    }
    catch (Exception ex)
    {

        throw;
    }
}

示例图：