WebView是WinForm框架中一个控件，用来对网页信息交互，有时Web自己开发的，有时Web是三方的。

下面通过一个例子来看看WebView2的使用。

首先看Web的逻辑，是一个商品添加页面，用AlpineJS和BootStrap来开发的，业务上点击添加按钮，弹出modal框窗，然后保存结果，完成添加，代码如下：

View

@{
    ViewData["Title"] = "商品管理";
}
@section Css{
    <style>
        .form-switch {
            display: flex !important;
            flex-direction: row-reverse !important;
            justify-content: space-between !important;
        }
</style>
}
<div x-data="querydata()" id="ttt">
    <div class="row" style="margin:4px">


        <div class="col-sm-4">
        </div>
        <div class="col-sm-4">
        </div>
        <div class="col-sm-4" style="text-align:right" style="margin:4px 0px">


            <button type="button" class="btn btn-info" data-bs-toggle="modal" data-bs-target="#addgoods">
                追加
            </button>


        </div>
    </div>
    <hr />


    <div class="mb-3 row">
        <table class="table table-striped">
            <thead>
                <tr>
                    <th>ID</th>
                    <th>名前</th>
                    <th>価格</th>
                    <th>説明</th>
                    <th>有効</th>
                    <th>シリアル番号</th>
                    <th>製品タイプ</th>
                    <th>操作</th>
                </tr>
            </thead>
            <tbody>
                <template x-for="goods in Goodses">
                    <tr>
                        <td x-text="goods.ID"></td>
                        <td x-text="goods.Name"></td>
                        <td x-text="goods.Price"></td>
                        <td x-text="goods.Describe"></td>
                        <td x-text="goods.Validate"></td>
                        <td x-text="goods.SerialNumber"> </td>
                        <td x-text="goods.GoodsType"></td>
                        <td>
                            <button type="button" class="btn btn-primary btn-sm" data-bs-toggle="modal" data-bs-target="#modifygoods" x-on:click="modify(goods)">改訂</button>
                            <button type="button" class="btn btn-danger btn-sm" x-on:click="remove(goods.ID)">消去</button>
                        </td>
                    </tr>
                </template>
            </tbody>
        </table>
    </div>
    <div class="modal fade" id="addgoods" data-bs-backdrop="static" data-bs-keyboard="false" tabindex="-1" aria-labelledby="staticBackdropLabel" aria-hidden="true">
        <div class="modal-dialog">
            <div class="modal-content">
                <div class="modal-header">
                    <h5 class="modal-title" id="staticBackdropLabel"> 追加Goods</h5>
                    <button type="button" class="btn-close" data-bs-dismiss="modal" aria-label="Close"></button>
                </div>
                <div class="modal-body">
                    <div class="container-fluid">
                        <div class="mb-3 row">
                            <label for="GoodsTypeID" class="col-sm-4 col-form-label">Goodsタイプ</label>
                            <div class="col-sm-8">


                                <select class="form-select" x-model="Goods.GoodsTypeID" id="GoodsTypeID" aria-label="Default select example">
                                    <option selected>製品タイプ</option>
                                    <template x-for="(item,index) in GoodsTypes" :key="index">
                                        <option x-text="item.Name" :value="item.ID"></option>
                                    </template>
                                </select>


                            </div>
                        </div>
                        <div class="mb-3 row">
                            <label for="name" class="col-sm-4 col-form-label">お名前</label>
                            <div class="col-sm-8">
                                <input type="text" class="form-control" x-model="Goods.Name" placeholder="" id="Name">
                            </div>
                        </div>


                        <div class="mb-3 row">
                            <label for="Price" class="col-sm-4 col-form-label">価格</label>
                            <div class="col-sm-8">
                                <input type="number" class="form-control" x-model="Goods.Price" placeholder="" min="1" id="Price">
                            </div>
                        </div>


                        <div class="mb-3 row">
                            <label for="Describe" class="col-sm-4 col-form-label">説明</label>
                            <div class="col-sm-8">
                                <input type="text" class="form-control" x-model="Goods.Describe" placeholder="" min="1" id="Describe">
                            </div>
                        </div>


                        <div class="mb-3 row">
                            <label for="SerialNumber" class="col-sm-4 col-form-label">シリアル番号</label>
                            <div class="col-sm-8">
                                <input type="number" class="form-control" x-model="Goods.SerialNumber" placeholder="" min="1" id="SerialNumber">
                            </div>
                        </div>
                        <div class="form-check form-switch mb-3 row" style="margin-left:150px">
                            <label class="form-check-label" for="IsCollapse">有効</label>
                            <input class="form-check-input" type="checkbox" role="switch" x-model="Goods.Validate" id="Validate" checked>
                        </div>


                        <div></div>
                    </div>
                    <div class="modal-footer">
                        <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">閉鎖</button>
                        <button type="button" class="btn btn-primary" data-bs-dismiss="modal" x-on:click="sava">保存</button>
                    </div>
                </div>
            </div>
        </div>
    </div>
    @section Scripts{
        <script src="~/js/Alpine.js" defer></script>
        <script>
            function querydata() {
                return {


                    GoodsTypes: [],
                    Goodses: [],
                    Goods: {
                        Name: '',
                        Price: 0,
                        Describe: '',
                        Validate: true,
                        SerialNumber: 0,
                        GoodsTypeID: 0,
                        GoodsType: '',
                    },
                    init() {
                        that = this
                        $.get("/home/goodses", {}, function (data) {
                            if (data != null) {
                                that.GoodsTypes = data.Data.GoodsTypes
                                that.Goodses = data.Data.Goodses
                            } else {
                                console.log("/Home/Goodses is error")
                            }
                        });
                    },
                    sava() {
                        $.ajax({
                            type: "POST",
                            url: "/home/goods",
                            data: this.Goods,
                            success: function (data) {


                                if (data.Result) {
                                    alert("送信に成功!")
                                    that.init()
                                    that.Goods = {
                                        Name: '',
                                        Price: 0,
                                        Describe: '',
                                        Validate: true,
                                        SerialNumber: 0,
                                        GoodsTypeID: 0,
                                        GoodsType: '',
                                    }
                                } else {
                                    alert("提出に失敗しました：" + data.Message)
                                }
                            }
                        });
                    }
                }
            }
</script>
    }
</div>

Controller

using Microsoft.AspNetCore.Mvc;
using System.Collections.Immutable;
using System.Diagnostics;
using WinFormDemo12WebHost.Models;


namespace WinFormDemo12WebHost.Controllers
{
    public class HomeController : Controller
    {
        private readonly ILogger<HomeController> _logger;


        public HomeController(ILogger<HomeController> logger)
        {
            _logger = logger;
        }
        public IActionResult Goods()
        {
            return View();
        }
        static List<GoodsType> _goodsTypes = new List<GoodsType> {
            new GoodsType {ID=1,Name="A类型" },
            new GoodsType {ID=2,Name="B类型" },
        };
        static List<Goods> _goodses = new List<Goods>
        {


        };
        [HttpGet("/home/goodses")]
        public async Task<JsonResult?> QueryGoodsesAsync()
        {
            try
            {
                _logger.LogInformation("BackQuery Goods List");
                var goodsTypes = _goodsTypes;
                var goodses = _goodses;


                return new JsonResult(
                    new
                    {
                        Data = new
                        {
                            GoodsTypes = goodsTypes,
                            Goodses = goodses
                        }
                    });
            }
            catch (Exception exc)
            {
                _logger.LogCritical(exc, exc.Message);
                return new JsonResult(new
                {
                    Result = false,
                    Message = exc.Message
                });
            }
        }
        [HttpDelete("/home/goods")]
        public async Task<JsonResult?> DeleteGoodsAsync(int id)
        {
            try
            {
                _logger.LogInformation("delete goods");
                var result = _goodses.Remove(_goodses.SingleOrDefault(s => s.ID == id));
                return new JsonResult(
                    new
                    {
                        Result = result
                    });
            }
            catch (Exception exc)
            {
                _logger.LogCritical(exc, exc.Message);
                return new JsonResult(new { Result = false, Message = exc.Message });
            }
        }
        [HttpPut("/home/goods")]
        public async Task<JsonResult?> ModifyGoodsAsync(Goods goods)
        {
            try
            {
                _logger.LogInformation("modify goods");
                _goodses.Remove(_goodses.SingleOrDefault(s => s.ID == goods.ID));
                goods.ID = _goodses.Max(s => s.ID) + 1;
                _goodses.Add(goods);
                return new JsonResult(
                    new
                    {
                        Result = goods
                    });
            }
            catch (Exception exc)
            {
                _logger.LogCritical(exc, exc.Message);
                return new JsonResult(new { Result = false, Message = exc.Message });
            }
        }
        [HttpPost("/home/goods")]
        public async Task<JsonResult?> AddGoodstAsync(Goods goods)
        {
            try
            {
                _logger.LogInformation("add goods");
                goods.ID = _goodses.Count > 0 ? _goodses.Max(s => s.ID) + 1 : 1;
                _goodses.Add(goods);
                return new JsonResult(
                    new
                    {
                        Result = true,
                        Data = goods
                    });
            }
            catch (Exception exc)
            {
                _logger.LogCritical(exc, exc.Message);
                return new JsonResult(new { Result = false, Message = exc.Message });
            }
        }   
    }
    public class GoodsType
    {
        public int ID { get; set; }
        public string? Name { get; set; }
    }
    public class Goods
    {
        public int ID { get; set; }
        public string? Name { get; set; }
        public decimal Price { get; set; }
        public string? Describe { get; set; }
        public bool Validate { get; set; }
        public int GoodsTypeID { get; set; }
        public int SerialNumber { get; set; }
        public string GoodsType { get; set; }
        public decimal MaxPrice
        {
            get
            {
                return Price >= 70000 ? Price + 3000 : (Price > 0 ? Price + 2000 : 0);
            }
        }
        public decimal MinPrice
        {
            get
            {
                return Price >= 70000 ? Price - 3000 : (Price > 2000 ? Price - 2000 : 0);
            }
        }
    }
}

WebView2与控件与Web的交互主要通过webView21.CoreWebView2.ExecuteScriptAsync方法完成，所以不同的Web内容，JS的写法不一样，当然这里的JS实现简单交互还行，更复杂的就有点吃力了，可以使用一些UI自动化工库来操作更快捷。在WinForm中使用WebView，更多的是用来展现数据，而不是互操作，所以下面只是一个简单交互例子而已。

下面是模拟三个动作：点击添加按钮，在商品添加页面中完成信息录入，然后点击保存按钮（即使保存成功或失败后的alter也能针对处理）。

using System.Collections.Generic;


namespace WinFormsDemo13
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            webView21.Source = new Uri(@"http://localhost:5026/home/goods");
        }
        private void button1_Click(object sender, EventArgs e)
        {
            var js = """
                $(".btn-info").click()
                """;
            webView21.CoreWebView2.ExecuteScriptAsync(js);
        }
        int sn = 1;
        private void button2_Click(object sender, EventArgs e)
        {
            int mark = DateTime.Now.Millisecond * 1000 + DateTime.Now.Microsecond;
            var js = $"""   
                var goods=document.querySelector('[x-data]')._x_dataStack[0].Goods;
                goods.GoodsTypeID={mark % 2 + 1};
                goods.Name="商品{mark}";
                goods.Price={100 * new Random().Next(1, 20)};
                goods.Describe="商品{mark}说明";
                goods.SerialNumber={sn};
                goods.Validate={(mark % 2 == 0).ToString().ToLower()};
                goods.GoodsType="{(mark % 2 == 0 ? "A类型" : "B类型")}";
                """;
            webView21.CoreWebView2.ExecuteScriptAsync(js);
            sn++;
        }
        private void button3_Click(object sender, EventArgs e)
        {
            var js = """
                $("#addgoods .btn-primary").click()
                """;
            webView21.CoreWebView2.ExecuteScriptAsync(js);
        }     


        private void CoreWebView2_ScriptDialogOpening(object? sender, Microsoft.Web.WebView2.Core.CoreWebView2ScriptDialogOpeningEventArgs e)
        {
            e.Accept();
        }


        private void webView21_CoreWebView2InitializationCompleted(object sender, Microsoft.Web.WebView2.Core.CoreWebView2InitializationCompletedEventArgs e)
        {
            if (e.IsSuccess)
            {
                webView21.CoreWebView2.Settings.AreDefaultScriptDialogsEnabled = false;
                webView21.CoreWebView2.ScriptDialogOpening += CoreWebView2_ScriptDialogOpening;
            }
        }
    }
}

运行结果：