TreeListColumnBuilder<T>.Columns(Action<CollectionFactory<TreeListColumnBuilder<T>>>) Method

Provides access to the client-side columns option that represents a TreeList column collection.

Namespace: DevExtreme.AspNet.Mvc.Builders

Assembly: DevExtreme.AspNet.Core.dll

Declaration

public TreeListColumnBuilder<T> Columns(
    Action<CollectionFactory<TreeListColumnBuilder<T>>> configurator
)

Parameters

Name	Type	Description
configurator	Action<CollectionFactory<TreeListColumnBuilder<T>>>	A function that allows you to add items to the collection.

Returns

Type	Description
TreeListColumnBuilder<T>	A reference to this instance after the method is called.

Remarks

To configure a TreeList column collection, use a multiline lambda expression. In this case, a lambda parameter performs the role of a collection factory, and its Add() method adds a new item to the collection. The Add() method returns TreeListColumnBuilder<T> whose methods you can use to configure an item.

Razor C#

@(Html.DevExtreme().Gantt()
    .Columns(columns => {
        columns.Add().Columns(subColumns => {
            subColumns.Add(); // call methods to configure a TreeList column
            subColumns.Add();
        });
    })
)

Refer to Nested Options and Collections for more information.