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ComponentBuilder

轻松创建具有自动化功能的Blazor组件库,并同时支持 razor文件和 RenderTreeBuilder 两种方式。

English | 快速上手 | 在线文档

Latest Version

v4.x 支持 .net6 .net7

v5.x 支持 .net8

✨ 特性

  • 属性优先,从参数中优雅地定义 CSS
  • 轻松通过属性与组件关联
  • 可自定义CSS和组件的属性编码逻辑
  • 同时支持 razor文件 或 RenderTreeBuilder 来创建组件
  • 支持具有类似参数的组件的“预定义”
  • 动态且简单地和 JS 进行交互
  • 拦截器设计,为组件的生命周期赋予新的功能
  • 渲染器管道模式,以识别动态渲染组件
  • 丰富地 'RenderTreeBuilder' 扩展方法,代码片段轻松编写
  • 用 Fluent API 轻松创建元素和组件

🌈 组件定义

  • Button.razor
@inherits BlazorComponentBase

<button @attributes="@GetAttributes()">
    @ChildContent
</button>

@code{
    [CssClass("btn")]
    public Button()
    {
    }

    [Parameter][CssClass("active")]public bool Active { get; set; } 
	
	[Parameter][CssClass("btn-")]public Color? Color { get; set; } 

	[Parameter]public RenderFragment? ChildContent { get; set; } 

	[Parameter][HtmlData("tooltip")]public string? Tooltip { get; set; } 

	[Parameter][HtmlEvent("onclick")]public EventCallback<ClickEventArgs> OnClick { get; set; }

    [Parameter][HtmlAttribute]public string? Title { get; set; }
    
    public enum Color
    {
	    Primary,
	    Secondary,
	    [CssClass("info")]Information,
    }
}
  • Button.cs
[HtmlTag("button")]
[CssClass("btn")]
public class Button : BlazorComponentBase, IHasChildContent, IHasOnClick
{
	[Parameter][CssClass("active")]public bool Active { get; set; } 
	
	[Parameter][CssClass("btn-")]public Color? Color { get; set; } 

	[Parameter]public RenderFragment? ChildContent { get; set; }

	[Parameter][HtmlData("tooltip")]public string? Tooltip { get; set; }

	[Parameter][HtmlEvent("onclick")]public EventCallback<ClickEventArgs> OnClick { get; set; 

    [Parameter][HtmlAttribute]public string? Title { get; set; }
}

public enum Color
{
	Primary,
	Secondary,
	[CssClass("info")]Information,
}
  • 使用和对比
<!--razor-->
<Button Color="Color.Primary">Submit</Button>
<!--html-->
<button class="btn btn-primary">Submit</button>

<!--razor-->
<Button Active Tooltip="active button" Color="Color.Information" Title="click me">Active Button</Button>
<!--html-->
<button class="btn btn-info active" data-tooltip="active button" title="click me">Active Button</button>

🔑 C# 和 Javascript 交互

  • 导入模块
//in app.js
export function display(){
 // ...your code
}
[Inject]IJSRuntime JS { get; set; }

var js = await JS.Value.ImportAsync("./app.js");
js.display(); // same as function name
  • 动态运行 JS 代码
JS.Value.EvaluateAsync(window => {
    window.console.log("log")
});

JS.Value.EvaludateAsync(@"
    console.log(\"log\");
")
  • 快速使用 JS 回调 C# 代码
JS.Value.InvokeVoidAsync("myFunction", CallbackFactory.Create<string>(arg=> {
    //get arg from js
}));

JS.Value.InvokeVoidAsync("calculate", CallbackFactory.Create<int,int>((arg1,arg2)=> {
    //get value of arg1,arg2 from js
}))
function myFunction(dotNetRef){
    dotNetRef.invokeMethodAsync("Invoke", "arg");
}

function calculate(dotNetRef){
    dotNetRef.invokeMethodAsync("Invoke", 1, 2);
}

ℹ️ 个性化 CSS/Style/Attributes

  • Logical CSS
protected override void BuildCssClass(ICssClassBuilder builder)
{
    if(builder.Contains("annotation-enter"))
    {
        builder.Remove("annotation-exist");
    }
    else
    {
        builder.Append("annotation-enter").Append("annotation-exist");
    }
}
  • Logical Attributes
protected override void BuildAttributes(IDictionary<string, object> attributes)
{
    attributes["onclick"] = HtmlHelper.Event.Create(this, ()=>{ ... });
    
    if(attrbutes.ContainKey("data-toggle"))
    {
        attributes["data-toggle"] = "collapse";
    }
}

🌴 Fluent API

builder.Div()
        .Class("my-class")
        .Class("active", IsActive)
        .Class("text-block", !string.IsNullOrEmpty(Name))
        .Style($"font-size:{Size}px", Size.HasValue)
        .Content("hello world")
       .Close();

builder.Component<Button>()
        .Class("my-class")
        .Class("active", IsActive)
        .Class("text-block", !string.IsNullOrEmpty(Name))
        .Style((Size.HasValue, $"font-size:{Size}px"))
        .Content(ChildContent)
       .Close();

builder.Ul().ForEach("li", result => {
    result.attribute.Content($"content{result.index}");
});

🚸 关联组件

在 .razor 文件

  • List.razor 作为父组件
<ul @attributes="@GetAttributes()">
    <CascadingValue Value="this">
        @ChildContent
    </CascadingValue>
</ul>
  • ListItem.razor 作为子组件
<li @attributes="@GetAttributes()">@ChildContent</li>

@code{
    [ChildComponent(typeof(List))]
    public ListItem()
    {
    }

    [CascadingParameter] public List CascadedList { get; set; }

    [Parameter] public RenderFragment? ChildContent { get; set; }
}

在 RenderTreeBuilder 中

  • List 组件类
[ParentComponent] //作为父组件
[HtmlTag("ul")]
public class List : BlazorComponentBase, IHasChildContent
{

}
  • ListItem 组件类
[ChildComponent(typeof(List))] //强关联
[HtmlTag("li")]
public class ListItem : BlazorComponentBase, IHasChildContent
{
    [CascadingParameter]public List CascadedList { get; set; }

    [Parameter] public RenderFragment? ChildContent { get; set; }
}

组件的使用

<List>
    <ListItem>...</ListItem>
</List>

<ListItem /> <!--ListItem 组件不在 List 组件中将抛出异常-->

🔯 HtmlHelper

  • .razor
<div class="@GetCssClass"></div>

@code{
    string GetCssClass => HtmlHelper.Class.Append("btn-primary").Append("active", Actived).ToString();
}
  • 应用于 RenderTreeBuilder 时
builder.CreateElement(0, "span", attributes: 
    new { 
            @class = HtmlHelper.Class
                                .Append("btn-primary")
                                .Append("active", Actived),
            style = HtmlHelper.Style.Append($"width:{Width}px"),
            onclick = HtmlHelper.Event.Create<MouseEventArgs>(this, e=>{ //...click... });
        });

⚔️ 拦截器

您可以拦截组件的生命周期

  • 定义拦截器
public class LogInterceptor : ComponentInterceptorBase
{
    private readonly ILogger<LogInterceptor> _logger;
    public LogInterceptor(ILogger<LogInterceptor> logger)
    {
        _logger = logger;
    }

    //在 SetParameterAsync 方法中执行
    public override void InterceptSetParameters(IBlazorComponent component, ParameterView parameters)
    {
        foreach(var item in parameters)
        {
            _logger.LogDebug($"Key:{item.Name}, Value:{item.Value}");
        }
    }
}
  • 注册拦截器
builder.Services.AddComponentBuilder(configure => {
    configure.Interceptors.Add(new LogInterceptor());
})

BlazorComponentBase Lifecycle

♻️ 渲染器管道

识别特殊情况,以呈现指定的组件

public class NavLinkComponentRender : IComponentRender
{
    public bool Render(IBlazorComponent component, RenderTreeBuilder builder)
    {
        if ( component is IHasNavLink navLink )
        {
            builder.OpenComponent<NavLink>(0);
            builder.AddAttribute(1, nameof(NavLink.Match), navLink.Match);
            builder.AddAttribute(2, nameof(NavLink.ActiveClass), navLink.ActiveCssClass);
            builder.AddAttribute(3, nameof(NavLink.ChildContent), navLink.ChildContent);
            builder.AddMultipleAttributes(4, component.GetAttributes());
            builder.CloseComponent();
            return false;
        }
        return true;
    }
}
  • 注册渲染器
builder.Services.AddComponentBuilder(configure => {
    configure.Renderers.Add(typeof(NavLinkComponentRenderer));
});

📘 安装指南

  • Nuget.org 安装
Install-Package ComponentBuilder
  • 注册服务
builder.Services.AddComponentBuilder();

📝 组件库解决方案模板

使用 ComponentBuilder.Templates 生成组件库解决方案和在线演示站点

dotnet new install ComponentBuilder.Templates
dotnet new blazor-sln -n {YourRazorLibraryName}

更多信息见 templates