如何获取List <of_anonymous_type>的字段值（加上转换）？

Question

I have this code. At the very end we have List of anonymous objects with fields FILE_NAME , DATE , REPORT_LINK .

public ServiceResult Get(string userIdString)
{
    var userId = Int32.Parse(userIdString);
    var downloadLink = _serviceConfigManager.Parameters[ServiceResources.DownloadService].FirstOrDefault();
    var query = SharedUnitOfWork.Context.ReportRequest
        .Where(item => item.IS_DELETED == 0
                    && item.TENANT_ID == TenantId
                    && item.REPORT_STATE_ID == 2
                    && item.CREATED_BY_USER_ID == userId)
        .OrderByDescending(item => item.ID)
        .Take(10)
        .ToList()
        .Select(item => new
            {
                FILE_NAME = item.FILENAME,
                DATE = item.CREATION_DATE,
                REPORT_LINK = string.Format("{0}/{1}", downloadLink, item.ID)
            }
        );
    return new ServiceResult<object>(query.ToList());
}

First of all as you can see we return ServiceResult<object> object. The second, the returning type of function is ServiceResult (NOT GENERIC). This code i didnt write SO I CANT CHANGE THE SOURCE CODE of this method.

The task: In my unit tests i need to get returning object and check if it is populated with correct data. I wrote my test the way the function Get returns 2 records. SO, i need to check every field in this records. How to do that?

In my tests i get from this function variable of serviceResult name. How to "unwrap" serviceResult so as it looks like a List<of_something> and I could check List<of_something>[0].FILE_NAME , List<of_something>[1].FILE_NAME and etc?

serviceResult has Result field that equals query.ToList() .

TO MODERATORS : I read all offered similar topics, non of them describes|solves my task because I can't rewrite source code of Get function.

Answer 1

You can't get hold of the anonymous type. Your options are:

• use reflection ( GetType().GetProperty() etc) to read the data
• use dynamic

The latter is probably more convenient:

foreach(dynamic obj in listOfAnonObjects) {
    string filename = obj.FILE_NAME;
    DateTime date = obj.DATE;
    string link = obj.REPORT_LINK;

    // TODO: now use filename, date and link
}

You could use the above to project the data into your own list type that has well advertised properties.

Answer 2

Problem solved using Reflection.

Using pattern targetType.GetType().GetProperty(propertyName).GetValue(targetType,index:optional) I can get value of any field of anonymous type.

In case of indexer I use GetProperty("Item") and GetValue(targetType,new object[]{0}) , where the second parameter is needed index.