FdoToolbox.Base.Controls.FdoJoinDialog.btnFilter_Click C# (CSharp) Method

        private void btnFilter_Click(object sender, EventArgs e)
        {
            var cls = cmbClass.SelectedItem as ClassDefinition;
            if (cls != null)
            {
                var aliasedClasses = new Dictionary<string, ClassDefinition>();
                aliasedClasses.Add(txtJoinClassAlias.Text, cls);

                bool found = false;
                foreach (FeatureSchema fs in (FeatureSchemaCollection)cmbSchema.DataSource)
                {
                    if (fs.Name == _primarySchemaName)
                    {
                        foreach (ClassDefinition cd in fs.Classes)
                        {
                            if (cd.Name == _primaryClassName)
                            {
                                aliasedClasses.Add(_primaryClassAlias, cd);
                                found = true;
                                break;
                            }
                        }
                    }

                    if (found)
                        break;
                }

                string expr = ExpressionEditor.EditExpression(_conn, cls, aliasedClasses, txtJoinFilter.Text, ExpressionMode.Filter);
                if (expr != null)
                    txtJoinFilter.Text = expr;
            }
        }