通过Blazor使用C#开发SPA单页面应用程序(1)
通过Blazor使用C#开发SPA单页面应用程序(2)
通过Blazor使用C#开发SPA单页面应用程序(3)
前面学习了Blazor的特点、环境搭建及基础知识，现在我们尝试的做个实际的组件。
Ant Design是蚂蚁金服是基于Ant Design设计体系的 UI 组件库，主要用于研发企业级中后台产品。目前官方是基于React和Angular实现的，今年也推出了Vue的实现。其组件涵盖面较广，其组件风格及交互效果还是比较惊艳的，后面准备利用Ant Design的样式文件利用Blazor模仿几个组件的实现。
由于也是新学的Blazor开发，可能实现的方式有些笨拙，希望高手提出宝贵意见，先看看实现的Button 按钮、Grid 栅格、导航栏的效果。
先来看看Button按钮，它支持多种风格，是否只显示图标，loading状态等。实现步骤及主要代码且听我娓娓道来，
首先去antd.css cdn 下载稳定版的css文件，放到 wwwroot 文件夹下。再 _Host.cshtml 引用该文件。
AButtonBase类定义了按钮的属性参数；注册了class名称（例如：class="ant-btn ant-btn-primary"）的计算表达式，class内容是根据属性参数的设置情况计算出来的。
属性set 的 ClassMapper.Dirty() 是通知样式名生成方法属性改变了需要重新生成样式名称。
而ClassMapper是用于注册组件需要用到的样式构建类，PrefixCls（）是添加样式共用的前缀，Add有多个重载，可以是直接的样式名称；也可以是根据第一个参数的bool表达式来确定，第二个参数的样式是否启用。
using BlazorAntDesign.Core;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.RenderTree;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace BlazorAntDesign.General
{ public class AButtonBase : BaseComponent
{
#region Properties
/// <summary>
/// 设置按钮大小，可选值为 Small、Large 或者不设
/// </summary>
[Parameter]
protected AButtonSizes ButtonSize
{
get => buttonSize;
set
{
buttonSize = value;
ClassMapper.Dirty();
}
}
private AButtonSizes buttonSize = AButtonSizes.Default;
/// <summary>
/// 设置按钮类型，可选值为 Primary、Dashed、Danger 或者不设
/// </summary>
[Parameter]
protected AButtonTypes ButtonType
{
get => buttonType;
set
{
buttonType = value;
ClassMapper.Dirty();
}
}
private AButtonTypes buttonType = AButtonTypes.Default;
/// <summary>
/// 设置按钮形状，可选值为 Circle、 Round 或者不设
/// </summary>
[Parameter]
protected AButtonShapes ButtonShape
{
get => buttonShape;
set
{
buttonShape = value;
ClassMapper.Dirty();
}
}
private AButtonShapes buttonShape = AButtonShapes.Default;
/// <summary>
/// 设置 button 原生的 type 值，可选值请参考 HTML 标准
/// </summary>
[Parameter]
protected AButtonHTMLTypes HtmlType { get; set; } = AButtonHTMLTypes.Button;
/// <summary>
/// 按钮标题
/// </summary>
[Parameter]
protected string Title
{
get => title;
set
{
title = value;
ClassMapper.Dirty();
}
}
private string title;
/// <summary>
/// 设置按钮的图标名称
/// </summary>
[Parameter]
protected string IconName { get; set; }
/// <summary>
/// 将按钮宽度调整为其父宽度的选项
/// </summary>
[Parameter]
protected bool Block
{
get => block;
set
{
block = value;
ClassMapper.Dirty();
}
}
private bool block;
/// <summary>
/// 幽灵属性，使按钮背景透明。幽灵按钮将按钮的内容反色，背景变为透明，常用在有色背景上。
/// </summary>
[Parameter]
protected bool Ghost
{
get => ghost;
set
{
ghost = value;
ClassMapper.Dirty();
}
}
private bool ghost;
/// <summary>
/// 设置按钮载入状态
/// </summary>
[Parameter]
protected bool Loading
{
get => loading;
set
{
loading = value;
ClassMapper.Dirty();
}
}
private bool loading;
/// <summary>
/// 按钮失效状态
/// </summary>
[Parameter]
protected bool Disabled { get; set; }
[Parameter]
protected RenderFragment ChildContent { get; set; }
/// <summary>
/// 点击按钮时的回调
/// </summary>
[Parameter]
public EventCallback<UIMouseEventArgs> OnClick { get; set; }
//protected System.Action Clicked { get; set; }
protected bool click_animating { get; set; }
#endregion
protected override void RegisterClasses()
{
ClassMapper.PrefixCls("ant-btn")
.Add(() => ClassMapper.GetEnumName(buttonSize))
.Add(() => ClassMapper.GetEnumName(buttonType))
.Add(() => ClassMapper.GetEnumName(buttonShape))
.Add(() => Block, () => "block")
.Add(() => Ghost, () => "background-ghost")
.Add(() => Loading, () => "loading")
.Add(() => string.IsNullOrEmpty(title) && ChildContent == null, () => "icon-only");
base.RegisterClasses();
}
protected void buttonDown()
{
click_animating = false;
}
protected void buttonUp()
{
click_animating = true;
}
}
}
AButtonSizes、AButtonTypes、AButtonShapes、AButtonHTMLTypes 属性参数是定义的枚举，例如：
namespace BlazorAntDesign.General
{
/// <summary>
/// 按钮尺寸选项
/// </summary>
public enum AButtonSizes
{
/// <summary>
/// 缺省，中
/// </summary>
[ClassNamePart("")]
Default,
/// <summary>
/// 大
/// </summary>
[ClassNamePart("lg")]
Large,
/// <summary>
/// 小
/// </summary>
[ClassNamePart("sm")]
Small
}
}
namespace BlazorAntDesign.General
{
/// <summary>
/// 按钮类型选项
/// </summary>
public enum AButtonTypes
{
/// <summary>
/// 缺省，次按钮
/// </summary>
[ClassNamePart("")]
Default,
/// <summary>
/// 主按钮
/// </summary>
Primary,
/// <summary>
///
/// </summary>
Ghost,
/// <summary>
/// 虚线按钮
/// </summary>
Dashed,
Danger
}
}
AButtonBase类继承自自定义的BaseComponent，BaseComponent继承自Blazor的ComponentBase类。
BaseComponent主要定义了所有组件共用的属性，ElementId、Style、ClassMapper等，
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Components;
namespace BlazorAntDesign.Core
{
public abstract class BaseComponent : ComponentBase, IDisposable
{
#region Members
private bool disposed;
private ElementRef elementRef;
#endregion
#region Constructors
public BaseComponent()
{
ElementId = Utils.IDGenerator.Instance.Generate;
ClassMapper = new ClassMapper();
RegisterClasses();
}
#endregion
#region Methods
protected virtual void RegisterClasses()
{
ClassMapper.AddCustomClass(() => customClass);
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (!disposed)
{
if (disposing)
{
if (ClassMapper != null)
{
//ClassMapper.Dispose();
ClassMapper = null;
}
}
disposed = true;
}
}
#endregion
#region Properties
/// <summary>
/// 定义用户自定义的 ClassName
/// </summary>
[Parameter]
protected string ClassName
{
get => customClass;
set
{
customClass = value;
ClassMapper.Dirty();
}
}
private string customClass;
/// <summary>
/// Gets the reference to the rendered element.
/// </summary>
public ElementRef ElementRef { get => elementRef; protected set => elementRef = value; }
/// <summary>
/// 获取 element 唯一 Id.
/// </summary>
public string ElementId { get; }
[Parameter]
protected string Style { get; set; }
/// <summary>
/// 获取 ClassMapper.
/// </summary>
protected ClassMapper ClassMapper { get; private set; }
#endregion
}
}
@inherits BlazorAntDesign.General.AButtonBase
<button class="@ClassMapper.Class"
type="@(Enum.GetName(typeof(AButtonHTMLTypes), HtmlType).ToLower())"
ant-click-animating-without-extra-node="@(click_animating ? "true" : "")"
disabled="@Disabled"
@onkeydown="@buttonDown"
@onmousedown="@buttonDown"
@onkeyup="@buttonUp"
@onmouseup="@buttonUp"
@onclick="@OnClick">
@*图标*@
@if (Loading)
{<AIcon IconName="loading"></AIcon>}
else
{
if (!string.IsNullOrEmpty(IconName))
{<AIcon IconName="@IconName"></AIcon>}
}
@*标题*@
@if (!string.IsNullOrEmpty(Title))
{<span>@Title</span>}
@*子内容*@
@ChildContent</button>
其中 @inherits BlazorAntDesign.General.AButtonBase 是代码隐藏方式，指定后台代码继承自AButtonBase类，button class="@ClassMapper.Class"，将采用的样式根据指定的属性值计算出来赋值给button的class属性。下面根据属性设置判断是否显示图标、标题、子内容。
建立DemoButton.razor文件，样例代码如下：
@page "/DemoButton"
@using BlazorAntDesign.General;
<div style="border:1px solid beige;padding:10px">
<AButton Title="Default"></AButton>
<AButton Title="Primary" ButtonType="AButtonTypes.Primary"></AButton>
<AButton Title="Danger" ButtonType="AButtonTypes.Danger"></AButton>
<AButton Title="Dashed" ButtonType="AButtonTypes.Dashed"></AButton>
<AButton Title="Disabled" Disabled="true"></AButton>
<AButton ButtonType="AButtonTypes.Primary" IconName="download" ButtonShape="AButtonShapes.Circle"></AButton>
<AButton Title="下载" ButtonType="AButtonTypes.Primary" IconName="download" ButtonShape="AButtonShapes.Round"></AButton>
<AButton Title="下载" ButtonType="AButtonTypes.Primary" IconName="download"></AButton>
<AButtonGroup><AButton ButtonType="AButtonTypes.Primary" IconName="left">Backward</AButton><AButton ButtonType="AButtonTypes.Primary">Forward<AIcon IconName="right" /></AButton></AButtonGroup>
<AButton Title="Loading" ButtonType="AButtonTypes.Primary" Loading="true"></AButton>
<AButton Title="Click me!" ButtonType="AButtonTypes.Primary" Loading="@isLoading" OnClick="@(()=> { isLoading = true; })"></AButton>
</div>
<div style="border:1px solid beige;padding:10px;margin-top:5px">
<AButton IconName="search" ButtonType="AButtonTypes.Primary" ButtonShape="AButtonShapes.Circle"></AButton>
<AButton IconName="search" ButtonType="AButtonTypes.Primary">按钮</AButton>
<AButton IconName="search" ButtonShape="AButtonShapes.Circle"></AButton>
<AButton IconName="search">按钮</AButton>
<AButton IconName="search" ButtonType="AButtonTypes.Dashed" ButtonShape="AButtonShapes.Circle"></AButton>
<AButton IconName="search" ButtonType="AButtonTypes.Primary">按钮</AButton>
</div>
@code{
private bool isLoading = false;
private void LoadingClick()
{
isLoading = true;
}
}
@page "/DemoButton" 为组件路由
@using BlazorAntDesign.General; 为应用组件命名空间
好了Button的实现思路今天就学习到这了，希望有兴趣的同仁共同学习探讨，让Blazor真正走向SPA开发的舞台，让.net core七龙珠面向全栈开发，更好的拥抱社区，刷新业界对.net体系的认知。
Blazor 在发展：
微软已将 Blazor 移出了实验阶段，进入了官方预览版。使用组件模型进行服务器端渲染的 Blazor 版本将与.NET Core 3 的最终版本一起发布（请参阅.NET Core 路线图），客户端版本将在随后不久发布。还有工作要完成：调试体验极其有限，必须改进；有机会通过提前编译生成本机 Wasm 来优化代码性能；在将未使用的代码库发送到浏览器之前，需要从库中删除未使用的代码，从而降低总体大小（这个过程称为树抖动）。对 WebAsssembly 的兴趣和采用与日俱增，借助 Blazor，编写可以在任何地方运行的 C#和.NET 代码的梦想终于实现了。
原文链接：https://www.cnblogs.com/liuxtj/p/11377680.html
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