DataSourceResult in asp.net core - asp.net-mvc

Question

When i was worked in Asp.net Mvc , for paging data use KendoUi.this code use in Asp.net Mvc Web api
public DataSourceResult Get(HttpRequestMessage requestMessage)
{
var request = JsonConvert.DeserializeObject<DataSourceRequest>(
requestMessage.RequestUri.ParseQueryString().GetKey(0)
);
WebApplicationDbContext db = new WebApplicationDbContext();
var list = db.Product.ToList();
return list.AsQueryable()
.ToDataSourceResult(request.Take, request.Skip, request.Sort, request.Filter);
}
And now working with Asp.net Core when i was use this code , it doesn't work.
in the error list show to me this error
'Uri' does not contain a definition for 'ParseQueryString' and no
extension method 'ParseQueryString' accepting a first argument of type
'Uri' could be found (are you missing a using directive or an assembly
reference?)
How can i use this code in Asp.net Core?

Answer 1

First remove the HttpRequestMessage requestMessage parameter. Then remove the requestMessage.RequestUri.ParseQueryString().GetKey(0) part and replace it with:
var rawQueryString = this.HttpContext.Request.QueryString.ToString();
// PM> Install-Package Microsoft.AspNetCore.WebUtilities
var rawQueryStringKeyValue = QueryHelpers.ParseQuery(rawQueryString).FirstOrDefault();
var dataString = Uri.UnescapeDataString(rawQueryStringKeyValue.Key); // this is your received JSON data from Kendo UI

Answer 2

I'm not sure why you need to deserialize the request. I normally pass request to ToDataSourceResult extension method.
For example,
public JsonResult Get([DataSourceRequest] DataSourceRequest request)
{
var db = new WebApplicationDbContext();
return db.Product.ToDataSourceResult(request);
}

Answer 3

Thank you VahidN
This project has helped me a lot
KendoUI.Core.Samples
Im use this code in Controller
public DataSourceResult GetProducts()
{
var dataString = this.HttpContext.GetJsonDataFromQueryString();
var request = JsonConvert.DeserializeObject<DataSourceRequest>(dataString);
var list = ProductDataSource.LatestProducts;
return list.AsQueryable()
.ToDataSourceResult(request.Take, request.Skip, request.Sort, request.Filter);
}
And use this code in chstml
#{
ViewData["Title"] = "Home Page";
}
<!--Right to left grid-->
<div class="k-rtl">
<div id="report-grid"></div>
</div>
#section Scripts
{
<script type="text/javascript">
$(function () {
var productsDataSource = new kendo.data.DataSource({
transport: {
read: {
url: "#Url.Action("GetProducts", "Sample03")",
dataType: "json",
contentType: 'application/json; charset=utf-8',
type: 'GET'
},
parameterMap: function (options) {
return kendo.stringify(options);
}
},
schema: {
data: "data",
total: "total",
model: {
fields: {
"id": { type: "number" }, //Determine the field for dynamic search
"name": { type: "string" },
"isAvailable": { type: "boolean" },
"price": { type: "number" }
}
}
},
error: function (e) {
alert(e.errorThrown);
},
pageSize: 10,
sort: { field: "id", dir: "desc" },
serverPaging: true,
serverFiltering: true,
serverSorting: true
});
$("#report-grid").kendoGrid({
dataSource: productsDataSource,
autoBind: true,
scrollable: false,
pageable: true,
sortable: true,
filterable: true,
reorderable: true,
columnMenu: true,
columns: [
{ field: "id", title: "RowNumber", width: "130px" },
{ field: "name", title: "ProductName" },
{
field: "isAvailable", title: "Available",
template: '<input type="checkbox" #= isAvailable ? checked="checked" : "" # disabled="disabled" ></input>'
},
{ field: "price", title: "Price", format: "{0:c}" }
]
});
});
</script>
}