How can I override admin area view using plugin?

Hi,
How can I override admin area view using plugin? I have seen many plugin to override front side views and css/js but not to override admin area views or data/core classes. Is any way to do these?
Thanks.

Hello Atiqiub
Please try this to override view.

Step 1:  create CustomViewLocationExpander.cs file

public class CustomViewLocationExpander : IViewLocationExpander
{
    public IEnumerable<string> ExpandViewLocations(ViewLocationExpanderContext context, IEnumerable<string> viewLocations)
    {
            if (context.AreaName == "Admin" && context.ControllerName == "Product" && context.ViewName == "List")
            {
                viewLocations = new[] {"~/Plugins/Nop.Plugin.YourpluginName/Views/Admin/Product/List.cshtml",
                }.Concat(viewLocations);
            }
        return viewLocations;
    }

    public void PopulateValues(ViewLocationExpanderContext context)
    {
        //
    }
}

Step 2: Create PluginStartup.cs file

public class PluginDbStartup : INopStartup
{
    /// <summary>
    /// Add and configure any of the middleware
    /// </summary>
    /// <param name="services">Collection of service descriptors</param>
    /// <param name="configuration">Configuration of the application</param>
    public void ConfigureServices(IServiceCollection services, IConfiguration configuration)
    {
        // add view location expander
        services.Configure<RazorViewEngineOptions>(options =>
        {
            options.ViewLocationExpanders.Add(new CustomViewLocationExpander());
        });
    }

    /// <summary>
    /// Configure the using of added middleware
    /// </summary>
    /// <param name="application">Builder for configuring an application's request pipeline</param>
    public void Configure(IApplicationBuilder application)
    {
    }

    /// <summary>
    /// Gets order of this startup configuration implementation
    /// </summary>
    public int Order => 0;
}

But there is no "IViewLocationExpander" interface file exists in solution.

Hello
Which nopcommerce version you are working?

I required any example from existing plugin that use change in DB (Add a field in table or add new table) and modify any existing view in admin. So that I can review. Thanks.

Nop 4.2

I find DB change in plugin "Nop.Plugin.Shipping.FixedByWeightByTotal". But I also required to override an existing view of admin area.

None of the stardard plugins use it so can not provide an example
Add the using statment for the definition
This one overrides the OrderSummary in the front - the same principle should apply for Admin

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.AspNetCore.Mvc.Razor;
using Nop.Core.Data;
using Nop.Core.Infrastructure;
using Nop.Services.Plugins;

namespace Nop.Plugin.Group.Name.ViewEngine
{
    public class CustomViewEngine : IViewLocationExpander
    {
        public IEnumerable<string> ExpandViewLocations(ViewLocationExpanderContext context, IEnumerable<string> viewLocations)
        {
            if (plugin.SystemName == "Group.Name")
            {
                if (context.AreaName == null)
                {
                    if (context.ViewName == "Components/OrderSummary/Default")
                    {
                        viewLocations = new[] {                           $"~/Plugins/Group.Name/Views/Shared/Components/OrderSummary/Default.cshtml"
                                }
                        .Concat(viewLocations);
                    }
                }
            }
            return viewLocations;
        }

        public void PopulateValues(ViewLocationExpanderContext context)
        {
        }
    }
}