C# 组件中的调用方法
我有这个“警报”组件:C# 组件中的调用方法,c#,.net-core,blazor,C#,.net Core,Blazor,我有这个“警报”组件: @if (Show) { <div class="alert @Class" role="alert"> @Text </div> } @functions { [Parameter] private bool Show { get; set; } = false; [Parameter] private string Text { get; set; } = String.Emp
@if (Show)
{
<div class="alert @Class" role="alert">
@Text
</div>
}
@functions
{
[Parameter]
private bool Show { get; set; } = false;
[Parameter]
private string Text { get; set; } = String.Empty;
[Parameter]
private string Class { get; set; } = String.Empty; //Success, Warning etc.
}
@if(显示)
{
@正文
}
@功能
{
[参数]
私有bool Show{get;set;}=false;
[参数]
私有字符串文本{get;set;}=string.Empty;
[参数]
私有字符串类{get;set;}=string.Empty;//成功、警告等。
}
然而,当我在我的页面上调用这个组件时,我仍然需要创建至少两个变量——shourror和ErrorText——来处理这个警报的状态,因为这个警报几乎存在于所有页面上,所以我的代码仍然非常混乱
我的问题是:是否可以通过调用子组件中的ShowMessage方法来消除代码混乱?
例如:
页面
@page "/my-page"
@inject HttpClient Http
<!-- A lot of HTML code here -->
<Alert/>
<!-- A lot of HTML code here -->
@functions {
protected override async Task OnInitAsync()
{
var response = await Http.PostJsonAsync<Response>("/api/sessions/create", null);
if (response.StatusCode == HttpStatusCode.OK)
{
}
else
{
myAlertComponent.ShowSuccessMessage(response.Message);
}
}
}
@page”/my page
@注入HttpClient Http
@功能{
受保护的重写异步任务OnInitAsync()
{
var response=wait Http.PostJsonAsync(“/api/sessions/create”,null);
if(response.StatusCode==HttpStatusCode.OK)
{
}
其他的
{
myAlertComponent.ShowSuccessMessage(response.Message);
}
}
}
警报组件
@if (Show)
{
<div class="alert @Class" role="alert">
@Text
</div>
}
@functions
{
[Parameter]
private bool Show { get; set; } = false;
[Parameter]
private string Text { get; set; } = String.Empty;
[Parameter]
private string Class { get; set; } = String.Empty; //Success, Warning, Danger
public void HideAlerts()
{
Show = false;
}
public void ShowSuccessMessage(string message)
{
Show = true;
Text = message;
Class = "success":
}
public void ShowErrorMessage(string message)
{
Show = true;
Text = message;
Class = "danger":
}
}
@if(显示)
{
@正文
}
@功能
{
[参数]
私有bool Show{get;set;}=false;
[参数]
私有字符串文本{get;set;}=string.Empty;
[参数]
私有字符串类{get;set;}=string.Empty;//成功、警告、危险
公共空间藏身处()
{
Show=false;
}
公共无效ShowSuccessMessage(字符串消息)
{
Show=true;
文本=消息;
Class=“成功”:
}
公共消息(字符串消息)
{
Show=true;
文本=消息;
Class=“危险”:
}
}
这就是.NET(本例中为Blazor)中组件之间通信的执行方式
页面组件
定义封装具有单个参数的方法的操作委托
public event Action<string> DisplayAlert;
protected override async Task OnInitAsync()
{
var response = await Http.PostJsonAsync<Response> ("/api/sessions/create", null);
if (response.StatusCode == HttpStatusCode.OK)
{
// Success should be here, I believe
NotifyStateChanged(response.Message);
}
else
{
}
}
//Invoke any methods added to the event delegate:
private void NotifyStateChanged(string message) => DisplayAlert?.Invoke(message);
公共事件动作显示预警;
受保护的重写异步任务OnInitAsync()
{
var response=wait Http.PostJsonAsync(“/api/sessions/create”,null);
if(response.StatusCode==HttpStatusCode.OK)
{
//我相信成功就在这里
NotifyStateChanged(response.Message);
}
其他的
{
}
}
//调用添加到事件委托的任何方法:
私有void NotifyStateChanged(字符串消息)=>DisplayAlert?.Invoke(消息);
这是:
将对ShowSuccessMessage方法的引用分配给父组件中定义的DisplayAlert委托的实例
<Alert DisplayAlert = "@( str => ShowSuccessMessage(str))/>
<!-- A lot of HTML code here -->
-------------------------------------------------------------------------------
"Alert" component
----------------
Define a method whose signature corresponds to that defined by the delegate
private static void ShowSuccessMessage(string message)
{
Show = true;
Text = message;
Class = "success":
}