[英]How to databind to a property of an object within an object (Nested object's property)
[英]Need to find the nested dto object's property
我有以下帶有偽數據的DTO。.我想從StandardDTO對象中找到條目列表的數量:-
public class StandardDTO
{
public string InternalNotes { get; set; }
public string CustomerNotes { get; set; }
public List<Principal> Principals { get; set; }
public VerificationSummary VerificationSummary{ get; set; }
}
public class Principal
{
public string PrincipalTitle { get; set; }
public string PrincipalName { get; set; }
}
public class VerificationSummary
{
public List<Entry> Entries { get; set; }
public decimal GrossTotal { get; set; }
public decimal Total { get; set; }
}
public class Entry
{
public string PeriodName { get; set; }
public decimal Amount { get; set; }
}
void Main()
{
// Need to populate stdDTOObject and childXElement
int count = GetDTOObjectCount(GetStandardDTOObject(), "VerificationSummary");
count.Dump();
}
public StandardDTO GetStandardDTOObject()
{
StandardDTO stdDTOObj = new StandardDTO();
stdDTOObj.InternalNotes = "InternalNotes";
stdDTOObj.CustomerNotes = "CustomerNotes";
List<Principal> lstPrincipal = new List<Principal>();
Principal pObj = new Principal();
pObj.PrincipalTitle = "Mr";
pObj.PrincipalName = "ABC";
lstPrincipal.Add(pObj);
pObj = new Principal();
pObj.PrincipalTitle = "Mrs";
pObj.PrincipalName = "XYZ";
lstPrincipal.Add(pObj);
stdDTOObj.Principals = lstPrincipal;
VerificationSummary vs = new VerificationSummary();
List<Entry> lstEntry = new List<Entry>();
Entry entry = new Entry();
entry.PeriodName = "Sept17";
entry.Amount = 1212;
lstEntry.Add(entry);
entry = new Entry();
entry.PeriodName = "Oct17";
entry.Amount = 12000;
lstEntry.Add(entry);
entry = new Entry();
entry.PeriodName = "Nov17";
entry.Amount = 1000;
lstEntry.Add(entry);
entry = new Entry();
entry.PeriodName = "Dec17";
entry.Amount = 2000;
lstEntry.Add(entry);
entry = new Entry();
entry.PeriodName = "Jan18";
entry.Amount = 2000;
lstEntry.Add(entry);
vs.Entries = lstEntry;
vs.GrossTotal = 5555;
vs.Total = 10000;
stdDTOObj.VerificationSummary = vs;
return stdDTOObj;
}
public int GetDTOObjectCount<T>(T dtoObject, string nodeName)
{
var dtoObjectType = dtoObject.GetType();
var objectProperties = GetPropertyInfo(dtoObjectType);
return GetDTOOBjectCountRecursively(objectProperties, nodeName, dtoObject);
}
public int GetDTOOBjectCountRecursively<T>(IEnumerable<PropertyInfo> objectProperties, string nodeName, T dtoObject)
{
foreach (PropertyInfo propInfo in objectProperties)
{
if (propInfo.Name.Equals(nodeName, StringComparison.OrdinalIgnoreCase))
{
var lstDTOItems = propInfo.GetValue(dtoObject) as IList;
if (lstDTOItems != null)
{
return lstDTOItems.Count;
}
else
{
var objPropInfos = GetPropertyInfo(propInfo.PropertyType);
//hardcoded the nodeName just for this test.
return GetDTOOBjectCountRecursively(objPropInfos, "Entries", dtoObject);
}
}
}
return 0;
}
private IEnumerable<PropertyInfo> GetPropertyInfo(Type type)
{
return type.GetProperties();
}
問題是我無法在StandardDTO-> VerificationSummary->條目內遞歸循環
當propinfo =“ Entries” propinfo時,它在以下行失敗
var lstDTOItems = propInfo.GetValue(dtoObject)作為IList;
好。
由於以下語句,因此發生了錯誤:
return GetDTOOBjectCountRecursively(objPropInfos, "Entries", dtoObject);
發送“條目”時,需要發送已處理的新對象,如下所示:
return GetDTOOBjectCountRecursively(objPropInfos, "Entries", propInfo.GetValue(dtoObject));
這應該可以解決問題。
另外,要檢查通用列表,而不要這樣做:
var lstDTOItems = propInfo.GetValue(dtoObject) as IList;
您可以使用以下方法:
private bool IsList(Object obj)
{
return obj is IList && obj.GetType().IsGenericType;
}
哪個會更健壯。
為什么要使用反射?
您可以簡單地寫:
var obj = GetStandardDTOObject();
var count = obj.VerificationSummary.Entries.Count();
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