Distinct the collection in Linq C#

Question

I have the collection

From the collection the column name ma_position_value should not contain the same value

For Example

If the collection have 5 records, The column ma_position_value should not contain the same value from all 5 records...but it can contain same value for 2 or 3 or 4 records from the collection Atleast one column value should change.

So the main intension is ALL 5 records should not contain same value.Any one should get different value.So if all 5 is same I tried to throw a message

So I have just write a bool to return it if it is change

bool lblMa = false;
lblMa = ibusCalcWiz.iclbMssPaServiceSummary
        .Where(lbusMssPaServiceSummary => lbusMssPaServiceSummary.icdoSummary.ma_position_value.IsNotNullOrEmpty()).Distinct().Count() > 1;

But it is always return true.

Answer 1

Just select distinct ma_position_value property values:

bool allSame = ibusCalcWiz.iclbMssPaServiceSummary
                          .Select(i => i.ma_position_value)
                          .Distinct()
                          .Count() == 1;

HINT: Do not use long variable names in lambda expressions. There is a rule of thumb - the bigger scope of variable usage, the bigger should be name. If scope is very small (lambda expression) then name should be very small (single letter is enough).

Answer 2

You can get the first one, and check if they are all equal:

// Only works if the collection is non-empty!
string first_ma_position_value = ibusCalcWiz.iclbMssPaServiceSummary.First().ma_position_value;
bool allTheSame = ibusCalcWiz.iclbMssPaServiceSummary
   .All(lbusMssPaServiceSummary.icdoSummary.ma_position_value == first_ma_position_value);

or you can do the distinct, as you originally wanted, but on the value of the column instead of on the objects

bool allTheSame = ibusCalcWiz.iclbMssPaServiceSummary
               .Select(lbusMssPaServiceSummary => lbusMssPaServiceSummary.icdoSummary.ma_position_value)
               .Distinct()
               .Count() == 1;