public ICollection <VendorExample> GetVendors <T>(T typeOfICollectionToGet)
{
// simulate getting the list from the DB...
if (typeOfICollectionToGet.GetType() == typeof(List <VendorExample>))
{
List <VendorExample> vendorList = new List <VendorExample>();
for (int index = 0; index < 4; index++)
{
VendorExample vendorExample = new VendorExample(String.Format("some vendor name{0}", index.ToString()));
vendorList.Add(vendorExample);
}
return(vendorList);
}
else if (typeOfICollectionToGet.GetType() == typeof(VendorExample[]))
{
VendorExample[] vendorsArray = new VendorExample[3];
for (int index = 0; index < vendorsArray.Length; index++)
{
VendorExample vendorExample = new VendorExample(String.Format("some vendor name{0}", index.ToString()));
vendorsArray[index] = vendorExample;
}
return(vendorsArray);
}
for (int index = 0; index < 4; index++)
{
VendorExample vendorExample = new VendorExample(String.Format("some vendor name{0}", index.ToString()));
}
return(_iCollectionOfVendors);
}
private void BuildDummyData(int numberOfRecordsToCreate)
{
_listOfVendors = new List <VendorExample>();
for (int index = 0; index < numberOfRecordsToCreate; index++)
{
VendorExample vendorExample = new VendorExample();
vendorExample.VendorName = String.Format("some vendor name{0}", index.ToString());
vendorExample.VendorID = index;
vendorExample.VendorEmail = String.Format("test{0}@test.com", index.ToString());
_listOfVendors.Add(vendorExample);
}
}
public IEnumerable <VendorExample> GetVendorsWithIterator()
{
// using the yield keyword can be helpful when:
// - when a method should return one element at a time (Lazy Evaluation)
// - when you need a deferred execution (there is a delay in the return)
// - dont use this when its not needed as it can be confusing to debug/calling code
_iCollectionOfVendors = new List <VendorExample>();
for (int index = 0; index < 4; index++)
{
VendorExample vendorExample = new VendorExample(String.Format("some vendor name{0}", index.ToString()));
_iCollectionOfVendors.Add(vendorExample);
}
foreach (VendorExample vendorExample in _iCollectionOfVendors)
{
//Console.WriteLine(vendorExample.VendorName);
yield return(vendorExample);
}
}
private void RunGenericsOtherExamples()
{
Console.WriteLine("Using Interfaces as a parameter - List");
Console.WriteLine("-----------------------------------------------------");
EmailUtilitiesExample emailUtilitiesExample = new EmailUtilitiesExample();
List <VendorExample> vendorsList = new List <VendorExample>();
for (int index = 0; index < 4; index++)
{
VendorExample vendorExample = new VendorExample(String.Format("some vendor name{0}", index.ToString()));
vendorsList.Add(vendorExample);
}
emailUtilitiesExample.SendVendorsEmail(vendorsList);
Console.WriteLine("");
Console.WriteLine("");
//=======================================================================================
//=======================================================================================
Console.WriteLine("Using Interfaces as a parameter - Array");
Console.WriteLine("-----------------------------------------------------");
VendorExample[] vendorsArray = new VendorExample[3];
for (int index = 0; index < vendorsArray.Length; index++)
{
VendorExample vendorExample = new VendorExample(String.Format("some vendor name{0}", index.ToString()));
vendorsArray[index] = vendorExample;
}
emailUtilitiesExample.SendVendorsEmail(vendorsArray);
Console.WriteLine("");
Console.WriteLine("");
//=======================================================================================
//=======================================================================================
Console.WriteLine("Using Interfaces as a return type - List");
Console.WriteLine("-----------------------------------------------------");
DataBaseUtilitiesExample dataBaseUtilitiesExample = new DataBaseUtilitiesExample();
List <VendorExample> blah = dataBaseUtilitiesExample.GetVendors <List <VendorExample> >(new List <VendorExample>()).ToList();
foreach (VendorExample ex in blah)
{
Console.WriteLine(String.Format("vendor list: {0}", ex.VendorName));
}
Console.WriteLine("");
Console.WriteLine("");
Console.WriteLine("Using Interfaces as a return type - Array");
Console.WriteLine("-----------------------------------------------------");
VendorExample[] blah2 = dataBaseUtilitiesExample.GetVendors <VendorExample[]>(new VendorExample[1]).ToArray();
foreach (VendorExample ex in blah2)
{
Console.WriteLine(String.Format("vendor list: {0}", ex.VendorName));
}
Console.WriteLine("");
Console.WriteLine("");
//=======================================================================================
//=======================================================================================
Console.WriteLine("Using Yield as a return type");
Console.WriteLine("-----------------------------------------------------");
foreach (VendorExample ex in dataBaseUtilitiesExample.GetVendorsWithIterator())
{
Console.WriteLine(String.Format("vendor list: {0}", ex.VendorName));
}
}