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Asp.net core使用Razor试图引擎编写TagHelper 观天下

来源：博客园

之前使用wtm来进行快速开发


(资料图片)

wtm框架见：

https://wtmdoc.walkingtec.cn/

其前端选择Layui的情况下有大量的TagHelper，大幅度提高了开发效率

虽然已有的组件很丰富但也不能完全覆盖所有的需求，这个时候就需要自己写TagHelper。

参考了WTM源码，和微软官方文档

TagHelper虽然使用起来方便，但是大量的拼接字符串编写体验和可读性都不是很好。

理想的情况是能充分利用.net中强大的Razor引擎来编写TagHelper，从而更方便的进行组件复用。

可以从asp.net core中找到viewengine的使用方法

以封装一个wangEditor为例

TagHelper:

using Microsoft.AspNetCore.Html;using Microsoft.AspNetCore.Http;using Microsoft.AspNetCore.Mvc.ModelBinding;using Microsoft.AspNetCore.Mvc.Rendering;using Microsoft.AspNetCore.Mvc.ViewEngines;using Microsoft.AspNetCore.Mvc.ViewFeatures;using Microsoft.AspNetCore.Razor.TagHelpers;using System;using System.IO;using WalkingTec.Mvvm.Core;using WalkingTec.Mvvm.Core.Extensions;using WalkingTec.Mvvm.TagHelpers.LayUI;namespace TagHelpers{    [HtmlTargetElement("wt:wangeditor", Attributes = "field", TagStructure = TagStructure.WithoutEndTag)]    public class WangEditorTagHelper : TagHelper    {        public WangEditorTagHelper(ICompositeViewEngine viewEngine,IHttpContextAccessor httpContextAccessor)         {            _viewEngine = viewEngine;            _httpContextAccessor = httpContextAccessor;        }        public ModelExpression Field { get; set; }        public string Id { get; set; }        public string Name { get; set; }        public int Height { get; set; } = 300;        private ICompositeViewEngine _viewEngine;        private IHttpContextAccessor _httpContextAccessor;        public override void Process(TagHelperContext context, TagHelperOutput output)        {            var viewEngineResult = _viewEngine.GetView("~/Views/Shared/Components/WangEditor/", "Default.cshtml", false);            if (!viewEngineResult.Success)            {                throw new InvalidOperationException($"Couldn"t find view /Shared/Components/WangEditor/Default.cshtml");            }            using (var sr = new StringWriter())            {                var viewContext = new ViewContext();                viewContext.HttpContext = _httpContextAccessor.HttpContext;                viewContext.ViewData = new ViewDataDictionary(new EmptyModelMetadataProvider(), new ModelStateDictionary())                {                    Model = new WangEditorConfig()                    {                        Id = Id ?? Utils.GetIdByName(Field?.ModelExplorer.Container.ModelType.Name + "." + Field?.Name),                        Name = Name ?? Field?.Name,                        Value = Field?.Model?.ToString(),                        Height = Height                    }                };                viewContext.Writer = sr;                viewEngineResult.View.RenderAsync(viewContext).GetAwaiter().GetResult();                output.TagName = "div";                output.TagMode = TagMode.StartTagAndEndTag;                output.Content.SetHtmlContent(sr.ToString());            }        }    }    public class WangEditorConfig    {        public string Id { get; set; }        public string Name { get; set; }        public string Value { get; set; }        public int Height { get; set; }    }}

cshtml，使用razor视图引擎编写可读性就好了很多。

@using TagHelpers;@model WangEditorConfig
    
    
    
<script type="text/javascript">    (function(){        var wEditor = window.wangEditor;        var editorConfig = {            placeholder: "请输入...",            onChange(editor) {                var hidden = document.getElementById("@(Model.Id)-hidden");                var html = editor.getHtml();                hidden.value=html;            }        }        var editor = wEditor.createEditor({            selector: "#@(Model.Id)-editor-container",            html: "@Html.Raw(Model.Value)",            config: editorConfig,            mode: "default", // or "simple"        })        var toolbarConfig = {}        toolbarConfig.excludeKeys = [            "insertVideo", "insertImage"        ];        var toolbar = wEditor.createToolbar({            editor,            selector: "#@(Model.Id)-toolbar-container",            config: toolbarConfig,            mode: "simple", // or "simple"        })                console.log(toolbar.getConfig().toolbarKeys);    }());   </script>

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