The example of this article describes the C# method of downloading the HTML source code of a web page. Share it with everyone for your reference. The specific method is as follows:
public static class DownLoad_HTML { private static int FailCount = 0; //记录下载失败的次数 public static string GetHtml(string url) //传入要下载的网址 { string str = string.Empty; try { System.Net.WebRequest request = System.Net.WebRequest.Create(url); request.Timeout = 10000; //下载超时时间 request.Headers.Set("Pragma", "no-cache"); System.Net.WebResponse response = request.GetResponse(); System.IO.Stream streamReceive = response.GetResponseStream(); Encoding encoding = Encoding.GetEncoding("gb2312");//utf-8 网页文字编码 System.IO.StreamReader streamReader = new System.IO.StreamReader(streamReceive, encoding); str = streamReader.ReadToEnd(); streamReader.Close(); } catch (Exception ex) { FailCount++; if (FailCount > 5) { var result = System.Windows.Forms.MessageBox.Show("已下载失败" + FailCount + "次,是否要继续尝试?" + Environment.NewLine + ex.ToString(), "数据下载异常", System.Windows.Forms.MessageBoxButtons.YesNo, System.Windows.Forms.MessageBoxIcon.Error); if (result == System.Windows.Forms.DialogResult.Yes) { str = GetHtml(url); } else { System.Windows.Forms.MessageBox.Show("下载HTML失败" + Environment.NewLine + ex.ToString(), "下载HTML失败", System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Error); throw ex; } } else { str = GetHtml(url); } } FailCount = 0; //如果能执行到这一步就表示下载终于成功了 return str; }
I hope this article will be helpful to everyone’s C# programming
For more articles related to regular expressions for filtering HTML in C#, please pay attention to the PHP Chinese website!

How to build applications using .NET? Building applications using .NET can be achieved through the following steps: 1) Understand the basics of .NET, including C# language and cross-platform development support; 2) Learn core concepts such as components and working principles of the .NET ecosystem; 3) Master basic and advanced usage, from simple console applications to complex WebAPIs and database operations; 4) Be familiar with common errors and debugging techniques, such as configuration and database connection issues; 5) Application performance optimization and best practices, such as asynchronous programming and caching.

C# is widely used in enterprise-level applications, game development, mobile applications and web development. 1) In enterprise-level applications, C# is often used for ASP.NETCore to develop WebAPI. 2) In game development, C# is combined with the Unity engine to realize role control and other functions. 3) C# supports polymorphism and asynchronous programming to improve code flexibility and application performance.

C# and .NET are suitable for web, desktop and mobile development. 1) In web development, ASP.NETCore supports cross-platform development. 2) Desktop development uses WPF and WinForms, which are suitable for different needs. 3) Mobile development realizes cross-platform applications through Xamarin.

The C#.NET ecosystem provides rich frameworks and libraries to help developers build applications efficiently. 1.ASP.NETCore is used to build high-performance web applications, 2.EntityFrameworkCore is used for database operations. By understanding the use and best practices of these tools, developers can improve the quality and performance of their applications.

How to deploy a C# .NET app to Azure or AWS? The answer is to use AzureAppService and AWSElasticBeanstalk. 1. On Azure, automate deployment using AzureAppService and AzurePipelines. 2. On AWS, use Amazon ElasticBeanstalk and AWSLambda to implement deployment and serverless compute.

The combination of C# and .NET provides developers with a powerful programming environment. 1) C# supports polymorphism and asynchronous programming, 2) .NET provides cross-platform capabilities and concurrent processing mechanisms, which makes them widely used in desktop, web and mobile application development.

.NETFramework is a software framework, and C# is a programming language. 1..NETFramework provides libraries and services, supporting desktop, web and mobile application development. 2.C# is designed for .NETFramework and supports modern programming functions. 3..NETFramework manages code execution through CLR, and the C# code is compiled into IL and runs by CLR. 4. Use .NETFramework to quickly develop applications, and C# provides advanced functions such as LINQ. 5. Common errors include type conversion and asynchronous programming deadlocks. VisualStudio tools are required for debugging.

C# is a modern, object-oriented programming language developed by Microsoft, and .NET is a development framework provided by Microsoft. C# combines the performance of C and the simplicity of Java, and is suitable for building various applications. The .NET framework supports multiple languages, provides garbage collection mechanisms, and simplifies memory management.


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