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960068: SelectedElementUG
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‎UG-Samples/Interaction/SelectedElements/README.md‎

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#Diagram Select Change event
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This sample demonstrates how to access and modify the selected Node and selected connector during runtime.
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Demo link:
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https://blazor.syncfusion.com/demos/diagramcomponent/events?theme=fluent
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## Prerequisites
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* Visual Studio 2022
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## How to run the project
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* Checkout this project to a location in your disk.
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* Open the solution file using the Visual Studio 2022.
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* Restore the NuGet packages by rebuilding the solution.
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* Run the project.

‎UG-Samples/Interaction/SelectedElements/SelectedElements/App.razor‎

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@namespace SelectedElements
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<Router AppAssembly="@typeof(App).Assembly">
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<Found Context="routeData">
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<RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
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<FocusOnNavigate RouteData="@routeData" Selector="h1" />
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</Found>
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<NotFound>
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<PageTitle>Not found</PageTitle>
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<LayoutView Layout="@typeof(MainLayout)">
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<p role="alert">Sorry, there's nothing at this address.</p>
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</LayoutView>
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</NotFound>
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</Router>
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‎UG-Samples/Interaction/SelectedElements/SelectedElements/Pages/Index.razor‎

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@page "/"
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@using Syncfusion.Blazor.Diagram
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<SfDiagramComponent @ref="diagram" Height="600px" Nodes="@NodeCollection" Connectors="@ConnectorCollection"
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SelectionChanged="OnSelectionChanged">
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</SfDiagramComponent>
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@code {
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SfDiagramComponent diagram;
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//Initailize the diagram's nodes collection
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public DiagramObjectCollection<Node> NodeCollection = new DiagramObjectCollection<Node>();
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//Initailize the diagram's connector collection
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public DiagramObjectCollection<Connector> ConnectorCollection = new DiagramObjectCollection<Connector>();
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protected override void OnInitialized()
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{
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Node node1 = new Node()
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{
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OffsetX = 100,
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OffsetY = 200,
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Height = 100,
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Width = 100,
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ID = "node1",
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};
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NodeCollection.Add(node1);
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Connector connector1 = new Connector()
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{
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ID = "connector1",
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SourcePoint = new DiagramPoint() { X = 300, Y = 100 },
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TargetPoint = new DiagramPoint() { X = 400, Y = 300 },
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Type = ConnectorSegmentType.Orthogonal
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};
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ConnectorCollection.Add(connector1);
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}
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//Event to notify selection changing event after selected the nodes/conenctors in diagram.
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private void OnSelectionChanged(SelectionChangedEventArgs args)
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{
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if (diagram.SelectionSettings.Nodes.Count > 0)
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{
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Node selectedNode = diagram.SelectionSettings.Nodes[0];
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//Here you can modified the selected node.
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}
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if (diagram.SelectionSettings.Connectors.Count > 0)
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{
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Connector selectedConnector = diagram.SelectionSettings.Connectors[0];
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//Here you can modified the selected connector.
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}
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}
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}

‎UG-Samples/Interaction/SelectedElements/SelectedElements/Pages/_Host.cshtml‎

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@page "/"
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@namespace SelectedElements.Pages
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@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
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@{
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Layout = "_Layout";
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}
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<component type="typeof(App)" render-mode="ServerPrerendered" />

‎UG-Samples/Interaction/SelectedElements/SelectedElements/Pages/_Layout.cshtml‎

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@using Microsoft.AspNetCore.Components.Web
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@namespace SelectedElements.Pages
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@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<base href="~/" />
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<link rel="stylesheet" href="css/bootstrap/bootstrap.min.css" />
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<link href="css/site.css" rel="stylesheet" />
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<script src="_content/Syncfusion.Blazor.Core/scripts/syncfusion-blazor.min.js" type="text/javascript"></script>
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<link href="_content/Syncfusion.Blazor.Themes/bootstrap5.css" rel="stylesheet" />
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<component type="typeof(HeadOutlet)" render-mode="ServerPrerendered" />
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</head>
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<body>
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@RenderBody()
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<script src="_framework/blazor.server.js"></script>
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</body>
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</html>

‎UG-Samples/Interaction/SelectedElements/SelectedElements/Program.cs‎

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using Microsoft.AspNetCore.Components;
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using Microsoft.AspNetCore.Components.Web;
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using Syncfusion.Blazor;
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var builder = WebApplication.CreateBuilder(args);
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// Add services to the container.
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builder.Services.AddRazorPages();
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builder.Services.AddServerSideBlazor();
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builder.Services.AddSyncfusionBlazor();
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var app = builder.Build();
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// Configure the HTTP request pipeline.
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if (!app.Environment.IsDevelopment())
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{
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app.UseExceptionHandler("/Error");
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// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
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app.UseHsts();
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}
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app.UseHttpsRedirection();
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app.UseStaticFiles();
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app.UseRouting();
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app.MapBlazorHub();
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app.MapFallbackToPage("/_Host");
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app.Run();

‎UG-Samples/Interaction/SelectedElements/SelectedElements/Properties/launchSettings.json‎

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{
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"iisSettings": {
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"windowsAuthentication": false,
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"anonymousAuthentication": true,
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"iisExpress": {
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"applicationUrl": "http://localhost:11920",
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"sslPort": 44341
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}
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},
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"profiles": {
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"DiagramSelectionEvent": {
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"commandName": "Project",
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"dotnetRunMessages": true,
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"launchBrowser": true,
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"applicationUrl": "https://localhost:7204;http://localhost:5236",
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"environmentVariables": {
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"ASPNETCORE_ENVIRONMENT": "Development"
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}
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},
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"IIS Express": {
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"commandName": "IISExpress",
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"launchBrowser": true,
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"environmentVariables": {
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"ASPNETCORE_ENVIRONMENT": "Development"
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}
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}
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}
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}

‎UG-Samples/Interaction/SelectedElements/SelectedElements/SelectedElements_NET8.csproj‎

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<?xml version="1.0" encoding="utf-8"?>
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<Project Sdk="Microsoft.NET.Sdk.Web">
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<PropertyGroup>
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<TargetFramework>net8.0</TargetFramework>
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<Nullable>enable</Nullable>
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<ImplicitUsings>enable</ImplicitUsings>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="Syncfusion.Blazor.Diagram" Version="*" />
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<PackageReference Include="Syncfusion.Blazor.Themes" Version="*" />
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</ItemGroup>
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<ItemGroup>
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<Folder Include="wwwroot\" />
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</ItemGroup>
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</Project>

‎UG-Samples/Interaction/SelectedElements/SelectedElements/SelectedElements_NET9.csproj‎

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<?xml version="1.0" encoding="utf-8"?>
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<Project Sdk="Microsoft.NET.Sdk.Web">
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<PropertyGroup>
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<TargetFramework>net9.0</TargetFramework>
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<Nullable>enable</Nullable>
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<ImplicitUsings>enable</ImplicitUsings>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="Syncfusion.Blazor.Diagram" Version="*" />
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<PackageReference Include="Syncfusion.Blazor.Themes" Version="*" />
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</ItemGroup>
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<ItemGroup>
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<Folder Include="wwwroot\" />
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</ItemGroup>
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</Project>

‎UG-Samples/Interaction/SelectedElements/SelectedElements/Shared/MainLayout.razor‎

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@namespace SelectedElements.Shared
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@inherits LayoutComponentBase
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<PageTitle>DiagramSelectionEvent</PageTitle>
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<div class="page">
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<div class="sidebar">
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<NavMenu />
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</div>
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<main>
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<article class="content px-4">
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@Body
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</article>
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</main>
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</div>

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