Kendo.DynamicLinqCore

Description

Kendo.DynamicLinqCore implements server paging, filtering, sorting, grouping and aggregating to Kendo UI via Dynamic Linq for .Net Core App(1.x ~ 2.x).

Usage

Add the Kendo.DynamicLinqCore NuGet package to your project.
Configure your Kendo DataSource to send its options as JSON.

parameterMap: function(options, type) {
    return JSON.stringify(options);
}

Configure the schema of the dataSource.

schema: {
    data: "Data",
    total: "Total",
    aggregates: "Aggregates",
    groups: "Groups",
    errors: "Errors"
}

The completed code like below.

..... Other kendo grid code .....

dataSource: {
    schema:
    {
        data: "Data",
        total: "Total",
        aggregates: "Aggregates",
        groups: "Groups",
        errors: "Errors",
        ...
    },
    transport: {
        read: {
            url: 'your read url',
            dataType: 'json',
            contentType: 'application/json; charset=utf-8',
            type: 'POST'
        },
        create: {
            url: 'your create url',
            dataType: "json",
            contentType: 'application/json; charset=utf-8',
            type: 'POST'
        },
        parameterMap: function (data, operation) {
            return JSON.stringify(data);
        }
    },
    error: function(e) {
        console.log(e.errors); // Your error information
        e.sender.cancelChanges();
    },
    pageSize: 20,
    serverPaging: true,
    serverFiltering: true,
    serverSorting: true,
    ...
}

..... Other kendo grid code .....

Import the Kendo.DynamicLinqCore namespace.
Use the ToDataSourceResult extension method to apply paging, sorting, filtering, grouping and aggregating.

using Kendo.DynamicLinqCore

[WebMethod]
public static DataSourceResult Products(int take, int skip, IEnumerable<Sort> sort, Filter filter, IEnumerable<Aggregator> aggregates, IEnumerable<Group> groups)
{
    using (var northwind = new Northwind())
    {
        return northwind.Products
               .OrderBy(p => p.ProductID) // EF requires ordering for paging                    
               .Select(p => new ProductViewModel // Use a view model to avoid serializing internal Entity Framework properties as JSON
               {
                   ProductID = p.ProductID,
                   ProductName = p.ProductName,
                   UnitPrice = p.UnitPrice,
                   UnitsInStock = p.UnitsInStock,
                   Discontinued = p.Discontinued
               })
               .ToDataSourceResult(take, skip, sort, filter, aggregates, groups);
    }
}

or from Kendo UI request

using Kendo.DynamicLinqCore

[HttpPost]
public IActionResult Products([FromBody] DataSourceRequest requestModel)
{
    using (var northwind = new Northwind())
    {
        return northwind.Products                  
               .Select(p => new ProductViewModel // Use a view model to avoid serializing internal Entity Framework properties as JSON
               {
                   ProductID = p.ProductID,
                   ProductName = p.ProductName,
                   UnitPrice = p.UnitPrice,
                   UnitsInStock = p.UnitsInStock,
                   Discontinued = p.Discontinued
               })
               .ToDataSourceResult(requestModel.Take, requestModel.Skip, requestModel.Sort, requestModel.Filter, requestModel.Aggregate, requestModel.Group);
    }
}

Known Issues

When server-side filterable options are enabled and apply a query with filter condition that contains DateTime type column, then EntityFramework Core would throw an exception System.Data.SqlClient.SqlException (0x80131904): Conversion failed when converting date and/or time from character string. The error is caused by a known issue in some old EntityFramework Core versions. The workaround is adding datetime value to the related column in DbContext. e.g.

public class MyContext : DbContext
{
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        ..........

        modelBuilder.Entity<Member>().Property(x => x.UpdateTime).HasColumnType("datetime");

        ..........
    }
}

How To Build NuGet Package

Open command line console
Switch to project root directory(src\Kendo.DynamicLinqCore).
Run "dotnet restore"
Run "dotnet pack --configuration Release"

Note

Kendo.DynamicLinqCore is a reference to Ali Sarkis's Kendo.DynamicLinq.

Kendo UI Documentation

The following links are Kendo UI online docs(related to this package) and you can refer to.

More Kendo UI configuration can refer to here