DxTreeView.SetNodesChecked(Func<ITreeViewNodeInfo, Boolean>, Boolean) Method

Checks or unchecks the specified nodes.

Assembly : DevExpress.Blazor.v25.2.dll

Declaration

csharp

public void SetNodesChecked(
    Func<ITreeViewNodeInfo, bool> predicate,
    bool check
)

Parameters

Name	Type	Description
predicate	Func<ITreeViewNodeInfo, Boolean>

A method delegate that specifies particular nodes.

| | check | Boolean |

true to check nodes; false to uncheck nodes.

Remarks

Use the SetNodesChecked method to check or uncheck the specified nodes in code.

The following code snippet expands the specified node and checks all its child nodes:

Razor
DataFlatSource.cs

razor

@using TreeView.Data

<DxTreeView @ref="MyTreeView"
            [email protected]
            CheckMode="TreeViewCheckMode.Multiple">
    <DataMappings>
        <DxTreeViewDataMapping Text="Product"
                               Key="Id"
                               ParentKey="ParentId" />
    </DataMappings>
</DxTreeView>

@code {
    DxTreeView MyTreeView;

    protected override void OnAfterRender(bool firstRender) {
        base.OnAfterRender(firstRender);
        if(firstRender) {
            MyTreeView.SetNodeExpanded(n => n.Text == "Clothing", true);
            MyTreeView.SetNodesChecked(n => n.Parent?.Text == "Clothing", true);
        }
    }
}

csharp

namespace TreeView.Data {
    public class DataFlatSource {
        public class ProductFlat {
            public string Product { get; set; }
            public int Id { get; set; }
            public int ParentId { get; set; }
        }
        public static IEnumerable<ProductFlat> DataFlat => new List<ProductFlat>() {
            new ProductFlat () { Product = "Bikes", Id = 1 },
            new ProductFlat () { Product = "Components", Id = 2 },
            new ProductFlat () { Product = "Clothing", Id = 3 },
            new ProductFlat () { Product = "Mountain Bikes", Id = 4, ParentId = 1 },
            new ProductFlat () { Product = "Road Bikes", Id = 5, ParentId = 1 },
            new ProductFlat () { Product = "Touring", Id = 6, ParentId = 1 },
            new ProductFlat () { Product = "Handlebars", Id = 7, ParentId = 2 },
            new ProductFlat () { Product = "Bottom Brackets", Id = 8, ParentId = 2 },
            new ProductFlat () { Product = "Brakes", Id = 9, ParentId = 2 },
            new ProductFlat () { Product = "Chains", Id = 10, ParentId = 2 },
            new ProductFlat () { Product = "Bib-Shorts", Id = 11, ParentId = 3 },
            new ProductFlat () { Product = "Gaps", Id = 12, ParentId = 3 },
            new ProductFlat () { Product = "Gloves", Id = 13, ParentId = 3 },
        };
    }
}