An explicit conversion exists when I try to group by using entity framework

Question

0.00/5 (No votes)

See more:

hi,
i try to group by using entity framework after filtering (Where Clause)

but this error appear :

Cannot implicitly convert type 'System.Linq.IQueryable<dataObjects.CLSPeopleActivities>' to 'System.Linq.IQueryable<view_people_history>'. An explicit conversion exists (are you missing a cast?)

at :

.Select(grp => new CLSPeopleActivities
                {
                    ID = grp.Key.PeopleID,
                    Name = grp.Key.pepole_Name,
                    Count = grp.Count(),
                    Amount = grp.Sum(f => f.NetValue),
                    Amount_Curr = grp.Sum(f => f.NetValue).ToString() + " " + currency,
                    PercentOfTotal_Count = (grp.Count() / sTotalCount) * 100,
                    PercentOfTotal_Amount = (grp.Sum(f => f.NetValue) / sTotalAmount) * 100,
                    PercentOfTotal_Count_perc  = ((grp.Count() / sTotalCount) * 100).ToString() + "%",
                    PercentOfTotal_Amount_perc = ((grp.Sum(f => f.NetValue) / sTotalAmount) * 100).ToString() + "%",
                });

What I have tried:

var Query = DB1.view_people_history.Where(u=> u.PeopleID != 0);

            // Filter With Date
            if (checkDate.Checked)
            {
                Query = Query.Where(u => u.Opdate >= From && u.Opdate <= To);
            }
            
            // Branchs
            if (checkBranch.Checked && branchids.Count() > 0) { Query = Query.Where(u => branchids.Contains(u.BranchID)); }

            // Exclude the main account
            if (checkOperation.Checked) { Query = Query.Where(u => !PeopleMainAccounts.Contains(u.PeopleID)); }

            // Filter With Operation Type
            switch (OpTypeInput.EditValue)
            {
                case "purchases":
                    Query = Query.Where(u => u.OpType == "PURCHASES");
                    break;

                case "sales":
                    Query = Query.Where(u => u.OpType == "SALES");
                    break;

                case "rpurchases":
                    Query = Query.Where(u => u.OpType == "RETURNED_PURCHASES");
                    break;

                case "rsales":
                    Query = Query.Where(u => u.OpType == "RETURNED_SALES");
                    break;
            }

            // get Totals
            int sTotalCount = Query.Count();
            decimal sTotalAmount = Query.Sum(s => s.NetValue.Value);
            string currency = CurrencyInfo.currencyShortcut();
            // Group
            Query = Query.GroupBy(s => new  
                {
                    s.PeopleID,
                    s.pepole_Name
                })
                .Select(grp => new CLSPeopleActivities
                {
                    ID = grp.Key.PeopleID,
                    Name = grp.Key.pepole_Name,
                    Count = grp.Count(),
                    Amount = grp.Sum(f => f.NetValue),
                    Amount_Curr = grp.Sum(f => f.NetValue).ToString() + " " + currency,
                    PercentOfTotal_Count = (grp.Count() / sTotalCount) * 100,
                    PercentOfTotal_Amount = (grp.Sum(f => f.NetValue) / sTotalAmount) * 100,
                    PercentOfTotal_Count_perc  = ((grp.Count() / sTotalCount) * 100).ToString() + "%",
                    PercentOfTotal_Amount_perc = ((grp.Sum(f => f.NetValue) / sTotalAmount) * 100).ToString() + "%",
                });

Posted 8-Jun-19 0:28am

Golden Basim

Updated 8-Jun-19 1:43am

v2

Add a Solution

Comments

Richard MacCutchan 8-Jun-19 6:37am

Do what the message tells you, and use a cast to the correct type.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Answer 1 · 2019-06-08T01:30:00

All it's saying is that the two types are related, but that no implicit conversion exists so it won't let you "just assign" the value - you can explicitly cast it because an explicit conversion does exist, but you have to make the compiler understand that that is what you wanted to do.

Because you declared Query as a var it gets it's type by context:

C#

var Query = DB1.view_people_history.Where(u=> u.PeopleID != 0);

And that makes it an IQueryable<view_people_history>Your subsequent Linq code returns a related class: IQueryable<dataObjects.CLSPeopleActivities> but that isn't exactly the same type so the system wants to make sure that is what you intended.