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c#silverlightwcfwcf-ria-services
rem
rem

Reputation: 17065

Silverlight WCF RIA Services. Check result of a boolean method

A Silverlight application uses WCF RIA Services for connection to a SQL Server database. Before inserting a bunch of new records into a table, I should check if this table contains any records with a certain value in one of the fields.

My server side method in Domain service class:

    [Invoke]
    public bool CheckRec(string nameFilter)
    {
        bool res = false;
        if (this.ObjectContext.MyTest.FirstOrDefault(p => p.Name == nameFilter) != null)
        {
            res = true;
        }            
        return res;
    }

How I could check the method result on the client? I'm trying the way like the following, but need some help to implement this correctly:

MyTestContext testcontext = new MyTestContext();
string tname =  savetdlg.TNameTBox.Text;
testcontext.CheckRec(tname).Completed += (df, fg) => 
                {
                    bool notunique = ?????? // how to get result of the method?
                    if (notunique == true)
                    {
                        //todo if record exists
                    }
                    else
                    {
                        //todo if record doesn't exist
                    }                   
                };

Upvotes: 0

Views: 1729

Answers (1)

rem
rem

Reputation: 17065

Well, done in the following way:

MyTestContext testcontext = new MyTestContext();
string tname =  savetdlg.TNameTBox.Text;

testcontext.CheckRec(tname, context_CheckRecCompleted, null);

void context_CheckRecCompleted(InvokeOperation<bool> op)
    {
        bool notunique = op.Value;
        if (notunique == true)
        {
            //todo if record exists
        }
        else
        {
            //todo if record doesn't exist
        }
    }

Upvotes: 2

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