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‎CS/TreeViewCustomFilter.sln‎

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio Version 17
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VisualStudioVersion = 17.0.32002.185
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TreeViewCustomFilter", "TreeViewCustomFilter\TreeViewCustomFilter.csproj", "{44E1B010-11E1-4537-BBA1-170CAE9F86B3}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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Release|Any CPU = Release|Any CPU
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{44E1B010-11E1-4537-BBA1-170CAE9F86B3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{44E1B010-11E1-4537-BBA1-170CAE9F86B3}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{44E1B010-11E1-4537-BBA1-170CAE9F86B3}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{44E1B010-11E1-4537-BBA1-170CAE9F86B3}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {3ED7015D-5113-4AB2-B141-D496461D4B2E}
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EndGlobalSection
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EndGlobal

‎CS/TreeViewCustomFilter/App.razor‎

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<Router AppAssembly="@typeof(Program).Assembly">
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<Found Context="routeData">
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<RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
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</Found>
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<NotFound>
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<LayoutView Layout="@typeof(MainLayout)">
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<p>Sorry, there's nothing at this address.</p>
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</LayoutView>
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</NotFound>
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</Router>

‎CS/TreeViewCustomFilter/Data/OfficeLocation.cs‎

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namespace TreeViewCustomFilter.Data {
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public class OfficeLocation {
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public static readonly OfficeLocation[] Offices = new[] {
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new OfficeLocation(){Name="Africa", Id = "1" },
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new OfficeLocation(){Name="Ethiopia", Id="2", ParentId="1" },
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new OfficeLocation(){Name="Dire Dawa", Id = "3", ParentId="2"},
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new OfficeLocation(){Name="Addis Ababa", Id="4", ParentId="2" },
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new OfficeLocation(){Name="Nigeria",Id = "5", ParentId="1"},
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new OfficeLocation(){Name="Lagos",Id = "6", ParentId="5"},
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new OfficeLocation(){Name="Kano",Id = "7", ParentId="5"},
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new OfficeLocation(){Name="Asia",Id = "8"},
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new OfficeLocation(){Name="China",Id = "9", ParentId="8"},
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new OfficeLocation(){Name="Beijing",Id = "10", ParentId="9"},
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new OfficeLocation(){Name="Shanghai",Id = "11", ParentId="9"},
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new OfficeLocation(){Name="India",Id = "12", ParentId="8"},
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new OfficeLocation(){Name="Indianapolis",Id = "13", ParentId="12"},
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new OfficeLocation(){Name="New Delhi",Id = "14", ParentId="12"},
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new OfficeLocation(){Name="Australia",Id = "15" },
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new OfficeLocation(){Name="Australia",Id = "16", ParentId="15"},
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new OfficeLocation(){Name="Canberra",Id = "17", ParentId="16"},
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new OfficeLocation(){Name="Melbourne",Id = "18", ParentId="16"},
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new OfficeLocation(){Name="Sydney",Id = "19", ParentId="16"},
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new OfficeLocation(){Name="Europe",Id = "20" },
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new OfficeLocation(){Name="Germany",Id = "21", ParentId="20"},
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new OfficeLocation(){Name="Berlin",Id = "22", ParentId="20"},
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new OfficeLocation(){Name="Hamburg",Id = "23", ParentId="20"},
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new OfficeLocation(){Name="France", Id="24", ParentId="20" },
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new OfficeLocation(){Name="Paris",Id = "25", ParentId="24"},
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new OfficeLocation(){Name="North America",Id = "26"},
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new OfficeLocation(){Name="Mexico",Id = "27", ParentId="26"},
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new OfficeLocation(){Name="Mexico City",Id = "28", ParentId="27"},
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new OfficeLocation(){Name="United States",Id = "29", ParentId="26"},
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new OfficeLocation(){Name="New York", Id="30", ParentId="29" },
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new OfficeLocation(){Name="Washington",Id = "31", ParentId="29"},
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new OfficeLocation(){Name="South America",Id = "32" },
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new OfficeLocation(){Name="Brazil",Id = "33", ParentId="32"},
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new OfficeLocation(){Name="Brasilia",Id = "34", ParentId="33"},
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new OfficeLocation(){Name="Colombia",Id = "35", ParentId="32"},
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new OfficeLocation(){Name="Bogota",Id = "36", ParentId="35"}
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};
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public string Id { get; set; }
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public string CssClass => "itemclass";
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public string ParentId { get; set; }
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public string Name { get; set; }
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}
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}

‎CS/TreeViewCustomFilter/NOTICE.txt‎

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The following open source libraries are used and included within thеse sample/demonstration projects:
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Bootstrap (Open Source – MIT License)
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Copyright (c) 2011-2021 Twitter, Inc. / Copyright (c) 2011-2021 The Bootstrap Authors
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https://github.com/twbs/bootstrap/blob/main/LICENSE
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open-iconic (Open Source – MIT License and SIL Open Font License)
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Copyright (c) 2014 Waybury
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https://github.com/iconic/open-iconic/blob/master/ICON-LICENSE
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https://github.com/iconic/open-iconic/blob/master/FONT-LICENSE
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The open source libraries included in these sample/demonstration projects are done so pursuant to each individual open source library license and subject to the disclaimers and limitations on liability set forth in each open source library license.

‎CS/TreeViewCustomFilter/Pages/Error.cshtml‎

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@page
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@model TreeViewCustomFilter.Pages.ErrorModel
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<!DOCTYPE html>
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<html>
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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, maximum-scale=1.0, user-scalable=no" />
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<title>Error</title>
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<link href="_content/DevExpress.Blazor.Themes/blazing-berry.bs5.css" rel="stylesheet" />
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<link href="~/css/site.css" rel="stylesheet" asp-append-version="true"/>
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</head>
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<body>
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<div class="px-4">
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<h1 class="text-danger">Error.</h1>
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<h2 class="text-danger">An error occurred while processing your request.</h2>
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@if (Model.ShowRequestId)
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{
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<p>
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<strong>Request ID:</strong> <code>@Model.RequestId</code>
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</p>
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}
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<h3>Development Mode</h3>
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<p>
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Swapping to the <strong>Development</strong> environment displays detailed information about the error that occurred.
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</p>
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<p>
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<strong>The Development environment shouldn't be enabled for deployed applications.</strong>
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It can result in displaying sensitive information from exceptions to end users.
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For local debugging, enable the <strong>Development</strong> environment by setting the <strong>ASPNETCORE_ENVIRONMENT</strong> environment variable to <strong>Development</strong>
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and restarting the app.
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</p>
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</div>
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</body>
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</html>

‎CS/TreeViewCustomFilter/Pages/Error.cshtml.cs‎

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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using System.Threading.Tasks;
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using Microsoft.AspNetCore.Mvc;
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using Microsoft.AspNetCore.Mvc.RazorPages;
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using Microsoft.Extensions.Logging;
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namespace TreeViewCustomFilter.Pages {
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[ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
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[IgnoreAntiforgeryToken]
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public class ErrorModel : PageModel {
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public string? RequestId { get; set; }
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public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
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private readonly ILogger<ErrorModel> _logger;
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public ErrorModel(ILogger<ErrorModel> logger) {
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_logger = logger;
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}
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public void OnGet() {
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RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier;
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}
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}
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}

‎CS/TreeViewCustomFilter/Pages/Index.razor‎

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@page "/"
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@using TreeViewCustomFilter.Data
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@using System.Text.RegularExpressions;
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<DxTreeView Data="@OfficeLocation.Offices"
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@bind-FilterString=FilterString
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ShowFilterPanel="true"
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CustomFilter=@CustomFilter>
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<NodeTextTemplate>
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<span>
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@Template(context)
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</span>
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</NodeTextTemplate>
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<DataMappings>
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<DxTreeViewDataMapping Key="Id" ParentKey="ParentId" Text="Name" />
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</DataMappings>
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</DxTreeView>
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@code {
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static IEnumerable<string> SplitByComma(string value) => value
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.Split(',', StringSplitOptions.TrimEntries | StringSplitOptions.RemoveEmptyEntries);
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string? FilterString { get; set; }
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bool CustomFilter(ITreeViewNodeInfo info) {
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return SplitByComma(info.FilterInfo.Value)
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.Any(word => info.Text.Contains(word, StringComparison.InvariantCultureIgnoreCase));
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}
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RenderFragment Template(ITreeViewNodeInfo info) {
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if(!info.FilterInfo.IsApplied)
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return @<text>@info.Text</text>;
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var words = SplitByComma(info.FilterInfo.Value);
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var pattern = $"(" + string.Join(")|(", words) + ")";
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var matched = Regex.Split(info.Text, pattern, RegexOptions.IgnoreCase | RegexOptions.CultureInvariant);
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return
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@<text>
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@foreach(var m in matched) {
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@if(Regex.IsMatch(m, pattern, RegexOptions.IgnoreCase | RegexOptions.CultureInvariant)) {
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<span class="dxbl-filter-content">@m</span>
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}
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else { @m }
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}
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</text>;
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}
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}

‎CS/TreeViewCustomFilter/Pages/_Host.cshtml‎

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@page "/"
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@namespace TreeViewCustomFilter.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" />

‎CS/TreeViewCustomFilter/Pages/_Layout.cshtml‎

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@using Microsoft.AspNetCore.Components.Web
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@namespace TreeViewCustomFilter.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 href="_content/DevExpress.Blazor.Themes/blazing-berry.bs5.css" rel="stylesheet" />
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<link href="~/css/site.css" rel="stylesheet" />
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<link href="TreeViewCustomFilter.styles.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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@{
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var isIEOrEdgeLegacy = Context.Request.Headers["User-Agent"]
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.Any(userAgent => userAgent.Contains("MSIE") || userAgent.Contains("Trident") || userAgent.Contains("Edge/"));
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}
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@if(isIEOrEdgeLegacy)
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{
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<component type="typeof(TreeViewCustomFilter.Shared.BrowserNotSupported)" render-mode="Static" />
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}
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else
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{
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@RenderBody()
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<div id="blazor-error-ui">
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<environment include="Staging,Production">
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An error has occurred. This application may no longer respond until reloaded.
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</environment>
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<environment include="Development">
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An unhandled exception has occurred. See browser dev tools for details.
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</environment>
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<a href="" class="reload">Reload</a>
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<a class="dismiss">🗙</a>
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</div>
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<script src="_framework/blazor.server.js"></script>
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}
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</body>
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</html>

‎CS/TreeViewCustomFilter/Program.cs‎

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using TreeViewCustomFilter.Data;
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using Microsoft.AspNetCore.Components;
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using Microsoft.AspNetCore.Components.Web;
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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.AddDevExpressBlazor();
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builder.Services.Configure<DevExpress.Blazor.Configuration.GlobalOptions>(options => {
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options.BootstrapVersion = DevExpress.Blazor.BootstrapVersion.v5;
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});
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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();

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