/
MainViewModel.cs
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/
MainViewModel.cs
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using DevExpress.Mvvm;
using EFCoreIssues.Issues;
using DevExpress.Mvvm.DataAnnotations;
using System;
using System.Linq.Expressions;
using DevExpress.Data.Filtering;
using DevExpress.Xpf.Data;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using DevExpress.Mvvm.Xpf;
using System.Collections;
namespace EFCoreIssues {
public class MainViewModel : ViewModelBase {
Expression<Func<Issue, bool>> MakeFilterExpression(CriteriaOperator filter) {
var converter = new GridFilterCriteriaToExpressionConverter<Issue>();
return converter.Convert(filter);
}
[Command]
public void FetchRows(FetchRowsAsyncArgs args) {
args.Result = Task.Run<FetchRowsResult>(() => {
var context = new IssuesContext();
var queryable = context.Issues.AsNoTracking()
.SortBy(args.SortOrder, defaultUniqueSortPropertyName: nameof(Issue.Id))
.Where(MakeFilterExpression((CriteriaOperator)args.Filter));
return queryable.Skip(args.Skip).Take(args.Take ?? 100).ToArray();
});
}
[Command]
public void GetTotalSummaries(GetSummariesAsyncArgs args) {
args.Result = Task.Run(() => {
var context = new IssuesContext();
var queryable = context.Issues.Where(MakeFilterExpression((CriteriaOperator)args.Filter));
return queryable.GetSummaries(args.Summaries);
});
}
IList _Users;
public IList Users {
get
{
if(_Users == null && !DevExpress.Mvvm.ViewModelBase.IsInDesignMode) {
var context = new IssuesContext();
_Users = context.Users.Select(user => new { Id = user.Id, Name = user.FirstName + " " + user.LastName }).ToArray();
}
return _Users;
}
}
}
}