C# 从Blazor上的串行端口读取
我是Blazor的新手,我正在尝试创建一个从串口读取的应用程序。 首先,我使用.Core 3.1创建了一个控制台应用程序 一切正常,所以我将代码移到Blazor,尽管当我设置调试点时,我可以看到代码正常工作,但我无法让UI显示值C# 从Blazor上的串行端口读取,c#,.net-core,blazor,blazor-server-side,C#,.net Core,Blazor,Blazor Server Side,我是Blazor的新手,我正在尝试创建一个从串口读取的应用程序。 首先,我使用.Core 3.1创建了一个控制台应用程序 一切正常,所以我将代码移到Blazor,尽管当我设置调试点时,我可以看到代码正常工作,但我无法让UI显示值 @using System; @using System.Diagnostics; @using System.IO.Ports; @using System.Threading; <head> <title>Main Scale M
@using System;
@using System.Diagnostics;
@using System.IO.Ports;
@using System.Threading;
<head>
<title>Main Scale Monitor</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="/css/all.css" rel="stylesheet">
<link href="/css/stylesheet.css" rel="stylesheet">
</head>
<div class="scale-monitor">
<div class="digital-monitor net-weight grid-line">
<div class="digital-monitor-left net-left">NET</div>
<div class="digital-monitor-center net-center" bind="@ScaleValue"></div>
<div class="digital-monitor-right net-right">Kg</div>
</div>
</div>
@code {
public string ScaleValue { get; set; } = "0.001";
protected override void OnAfterRender(bool firstRender)
{
if (firstRender)
{
System.IO.Ports.SerialPort mySerialPort = new System.IO.Ports.SerialPort("COM3");
mySerialPort.BaudRate = 9600;
mySerialPort.Parity = System.IO.Ports.Parity.None;
mySerialPort.StopBits = System.IO.Ports.StopBits.One;
mySerialPort.DataBits = 8;
mySerialPort.Handshake = System.IO.Ports.Handshake.None;
mySerialPort.NewLine = (@"&N");
mySerialPort.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(DataReceivedHandler);
if (!mySerialPort.IsOpen)
{
mySerialPort.Open();
}
}
}
private void DataReceivedHandler(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
System.IO.Ports.SerialPort sp = (System.IO.Ports.SerialPort)sender;
try
{
string indata = sp.ReadLine();
ScaleValue = indata.ToString(); //WHEN I PUT DEBUG HERE I CAN SEE THE CORRECT VALUE
}
catch (Exception ex)
{
string msg = ex.Message;
}
}
}
<style>
*, ::after, ::before {
box-sizing: unset;
}
.grid-line {
border: 1px solid black;
}
.scale-monitor {
display: grid;
grid-template-columns: 35% 35% 30%;
grid-template-rows: 50% 50%;
width: 100%;
height: 90%;
margin: 5px;
width: 1020px;
}
/*#region generic*/
.digital-monitor {
background: #000000;
color: greenyellow;
text-align: right;
font-family: digitalregular;
display: grid;
grid-template-columns: repeat(10, 1fr);
grid-template-rows: repeat(5, 1fr);
width: 95%;
height: 95%;
margin: 5px;
border-radius: 15px;
align-items: center;
}
/*#region generic scalemonitor*/
.digital-monitor-left {
writing-mode: vertical-rl;
opacity: 0.5;
grid-row: 1 / span 5;
grid-column: 1;
text-align: center;
grid-column: 1;
transform: rotate(180deg);
}
.digital-monitor-center {
grid-row: 2 / span 3;
grid-column: 2/ span 7;
text-align: right;
vertical-align: bottom;
}
.digital-monitor-right {
grid-row: 2 / span 3;
grid-column: 9/ span 2;
text-align: right;
opacity: 0.75;
margin-bottom: 0.4em;
margin-right: 3px;
align-self: self-end;
}
/*#endregion*/
/*#endregion*/
/*#region NET*/
.net-weight {
grid-column: 2;
grid-row: 1 / span 2;
height: 98%;
}
.net-left {
font-size: 40px;
}
.net-center {
font-size: 100px;
}
.net-right {
font-size: 40px;
}
/*#endregion NET*/
</style>
@使用系统;
@使用系统诊断;
@使用System.IO.Ports;
@使用系统线程;
主刻度监视器
网
公斤
@代码{
公共字符串ScaleValue{get;set;}=“0.001”;
受保护的覆盖无效OnAfterRender(布尔firstRender)
{
if(firstRender)
{
System.IO.Ports.SerialPort mySerialPort=new System.IO.Ports.SerialPort(“COM3”);
mySerialPort.BaudRate=9600;
mySerialPort.Parity=System.IO.Ports.Parity.None;
mySerialPort.StopBits=System.IO.Ports.StopBits.One;
mySerialPort.DataBits=8;
mySerialPort.Handshake=System.IO.Ports.Handshake.None;
mySerialPort.NewLine=(@“&N”);
mySerialPort.DataReceived+=新系统.IO.Ports.SerialDataReceiveDevenHandler(DataReceivedHandler);
如果(!mySerialPort.IsOpen)
{
mySerialPort.Open();
}
}
}
私有void DataReceivedHandler(对象发送方,System.IO.Ports.SerialDataReceivedEventArgs e)
{
System.IO.Ports.SerialPort sp=(System.IO.Ports.SerialPort)发送方;
尝试
{
字符串indata=sp.ReadLine();
ScaleValue=indata.ToString();//当我把DEBUG放在这里时,我可以看到正确的值
}
捕获(例外情况除外)
{
字符串msg=例如消息;
}
}
}
*,::之后,::之前{
盒子尺寸:未设置;
}
.网格线{
边框:1px纯黑;
}
.电子秤监视器{
显示:网格;
网格模板列:35%35%30%;
网格模板行:50%50%;
宽度:100%;
身高:90%;
保证金:5px;
宽度:1020px;
}
/*#区域属*/
.数字显示器{
背景:#000000;
颜色:绿黄色;
文本对齐:右对齐;
字体系列:digitalregular;
显示:网格;
网格模板列:重复(10,1fr);
网格模板行:重复(5,1fr);
宽度:95%;
身高:95%;
保证金:5px;
边界半径:15px;
对齐项目:居中;
}
/*#区域通用标度监视器*/
.数字显示器左{
写入方式:垂直rl;
不透明度:0.5;
网格行:1/5跨;
网格柱:1;
文本对齐:居中;
网格柱:1;
变换:旋转(180度);
}
.数字监控中心{
网格行:2/3跨;
格构柱:2/7跨;
文本对齐:右对齐;
垂直对齐:底部对齐;
}
.数字显示器对吗{
网格行:2/3跨;
格构柱:9/2跨;
文本对齐:右对齐;
不透明度:0.75;
边缘底部:0.4em;
右边距:3倍;
自对齐:自结束;
}
/*#端区*/
/*#端区*/
/*#区域网*/
.净重{
网格柱:2;
网格行:1/2跨;
身高:98%;
}
.net左{
字体大小:40px;
}
.net中心{
字体大小:100px;
}
.net权限{
字体大小:40px;
}
/*#端域网*/
您知道如何进行正确的绑定吗?来自Blazor生命周期:
“渲染后立即执行的异步工作必须在OnAfterRenderAsync生命周期事件期间发生
即使您从OnAfterRenderAsync返回任务,框架也不会在该任务完成后为组件安排进一步的渲染周期。这是为了避免无限的渲染循环。这与其他生命周期方法不同,后者在返回的任务完成后安排进一步的渲染周期。”
设置
ScaleValue
后,尝试手动调用StateHasChanged()
。您的问题在于尝试将值绑定到div
div
元素不是组件,不支持bind属性
试试这个:@ScaleValue
由于代码不依赖于页面的呈现,请将其设置为使用其他生命周期方法
尝试将其放入protectedoverride void OnInitialized(){}
编辑:
在这里阅读Blazor的生命周期:
编辑:代码示例
@using System;
@using System.Diagnostics;
@using System.IO.Ports;
@using System.Threading;
@page "/Test";
<head>
<title>Main Scale Monitor</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="/css/all.css" rel="stylesheet">
<link href="/css/stylesheet.css" rel="stylesheet">
</head>
<div class="scale-monitor">
<div class="digital-monitor net-weight grid-line">
<div class="digital-monitor-left net-left">NET</div>
<div class="digital-monitor-center net-center">@ScaleValue</div>
<div class="digital-monitor-right net-right">Kg</div>
</div>
</div>
@code {
public string ScaleValue { get; set; } = "0.001";
protected override void OnAfterRender(bool firstRender)
{
if (firstRender)
{
}
}
protected override void OnInitialized()
{
System.IO.Ports.SerialPort mySerialPort = new System.IO.Ports.SerialPort("COM3");
mySerialPort.BaudRate = 9600;
mySerialPort.Parity = System.IO.Ports.Parity.None;
mySerialPort.StopBits = System.IO.Ports.StopBits.One;
mySerialPort.DataBits = 8;
mySerialPort.Handshake = System.IO.Ports.Handshake.None;
mySerialPort.NewLine = (@"&N");
mySerialPort.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(DataReceivedHandler);
ScaleValue = "test";
//I skipped this part with a return, since I don't have COM3 locally
if (!mySerialPort.IsOpen)
{
mySerialPort.Open();
}
}
private void DataReceivedHandler(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
System.IO.Ports.SerialPort sp = (System.IO.Ports.SerialPort)sender;
try
{
string indata = sp.ReadLine();
ScaleValue = indata.ToString(); //WHEN I PUT DEBUG HERE I CAN SEE THE CORRECT VALUE
}
catch (Exception ex)
{
string msg = ex.Message;
}
}
}
<style>
*, ::after, ::before {
box-sizing: unset;
}
.grid-line {
border: 1px solid black;
}
.scale-monitor {
display: grid;
grid-template-columns: 35% 35% 30%;
grid-template-rows: 50% 50%;
width: 100%;
height: 90%;
margin: 5px;
width: 1020px;
}
/*#region generic*/
.digital-monitor {
background: #000000;
color: greenyellow;
text-align: right;
font-family: digitalregular;
display: grid;
grid-template-columns: repeat(10, 1fr);
grid-template-rows: repeat(5, 1fr);
width: 95%;
height: 95%;
margin: 5px;
border-radius: 15px;
align-items: center;
}
/*#region generic scalemonitor*/
.digital-monitor-left {
writing-mode: vertical-rl;
opacity: 0.5;
grid-row: 1 / span 5;
grid-column: 1;
text-align: center;
grid-column: 1;
transform: rotate(180deg);
}
.digital-monitor-center {
grid-row: 2 / span 3;
grid-column: 2/ span 7;
text-align: right;
vertical-align: bottom;
}
.digital-monitor-right {
grid-row: 2 / span 3;
grid-column: 9/ span 2;
text-align: right;
opacity: 0.75;
margin-bottom: 0.4em;
margin-right: 3px;
align-self: self-end;
}
/*#endregion*/
/*#endregion*/
/*#region NET*/
.net-weight {
grid-column: 2;
grid-row: 1 / span 2;
height: 98%;
}
.net-left {
font-size: 40px;
}
.net-center {
font-size: 100px;
}
.net-right {
font-size: 40px;
}
/*#endregion NET*/
</style>
@使用系统;
@使用系统诊断;
@使用System.IO.Ports;
@使用系统线程;
@页面“/测试”;
主刻度监视器
网
@标度值
公斤
@代码{
公共字符串ScaleValue{get;set;}=“0.001”;
受保护的覆盖无效OnAfterRender(布尔firstRender)
{
if(firstRender)
{
}
}
受保护的覆盖无效OnInitialized()
{
System.IO.Ports.SerialPort mySerialPort=new System.IO.Ports.SerialPort(“COM3”);
mySerialPort.BaudRate=9600;
mySerialPort.Parity=System.IO.Ports.Parity.None;
mySerialPort.StopBits=System.IO.Ports.StopBits.One;
mySerialPort.DataBits=8;
mySerialPort.Handshake=System.IO.Ports.Handshake.None;
mySerialPort.NewLine=(@“&N”);
mySerialPort.DataReceived+=新系统.IO.Ports.SerialDataReceiveDevenHandler(DataReceivedHandler);
ScaleValue=“测试”;
//我跳过了这一部分并返回,因为我在本地没有COM3
如果(!mySerialPort.IsOpen)
{
mySerialPort.Open();
}
}
私有void DataReceivedHandler(对象发送方,System.IO.Ports.SerialDataReceivedEventArgs e)
{
System.IO.Ports.SerialPort sp=(System.IO.Ports.SerialPort)发送方;
尝试
{
字符串索引=
public class ReadSerialPortService
{
public string SerialPortValue { get; set; }
public ReadSerialPortService()
{
System.IO.Ports.SerialPort mySerialPort = new System.IO.Ports.SerialPort("COM3");
mySerialPort.BaudRate = 9600;
mySerialPort.Parity = System.IO.Ports.Parity.None;
mySerialPort.StopBits = System.IO.Ports.StopBits.One;
mySerialPort.DataBits = 8;
mySerialPort.Handshake = System.IO.Ports.Handshake.None;
mySerialPort.NewLine = (@"&N");
if (!mySerialPort.IsOpen)
{
mySerialPort.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(DataReceivedHandler);
mySerialPort.Open();
}
}
private void DataReceivedHandler(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
System.IO.Ports.SerialPort sp = (System.IO.Ports.SerialPort)sender;
double scaleDec = 0.00;
try
{
string indata = sp.ReadLine();
SerialPortValue = indata.ToString();
}
catch (Exception ex)
{
string msg = ex.Message;
}
}
public Task<string> GetSerialValue()
{
return Task.FromResult(SerialPortValue);
}
}
@inject ReadSerialPortService _readSerialPortService
<head>
<title>Main Scale Monitor</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="/css/all.css" rel="stylesheet">
<link href="/css/stylesheet.css" rel="stylesheet">
</head>
<div class="scale-monitor">
<div class="digital-monitor net-weight grid-line" @onclick="GetValue">
<div class="digital-monitor-left net-left">NET</div>
<div class="digital-monitor-center net-center">@ScaleValue</div>
<div class="digital-monitor-right net-right">Kg</div>
</div>
</div>
@code {
private int Count { get; set; } = 100;
Timer _updateTimer;
public string ScaleValue { get; set; } = "0.000";
protected override async Task OnInitializedAsync()
{
ScaleValue = await _readSerialPortService.GetSerialValue();
_updateTimer = new Timer(state => { InvokeAsync(GetValue); }, null, 0, 100);
}
public async Task GetValue()
{
ScaleValue = await _readSerialPortService.GetSerialValue();
await InvokeAsync(() => StateHasChanged());
}
public void Dispose()
{
_updateTimer.Dispose();
}