捕获和转换Web的工具

使用ASP.NET从网站捕获HTML表ASP.NET API

有多种转换HTML表的方法 into使用JSON,CSV和Excel电子表格 GrabzIt的ASP.NET API,这里详细介绍了一些最有用的技术。 但是,在开始之前,请记住 URLToTable, HTMLToTable or 文件到表格 方法 Save or SaveTo 必须调用方法来捕获表。 如果您想快速查看此服务是否适合您,可以尝试 捕获HTML表的实时演示 从URL。

基本选项

以下代码示例转换指定网页中的第一个HTML表 intoa CSV文件。

grabzIt.URLToTable("https://www.tesla.com");
//Then call the Save or SaveTo method
grabzIt.HTMLToTable("<html><body><table><tr><th>Name</th><th>Age</th></tr>
    <tr><td>Tom</td><td>23</td></tr><tr><td>Nicola</td><td>26</td></tr>
    </table></body></html>");
//Then call the Save or SaveTo method
grabzIt.FileToTable("tables.html");
//Then call the Save or SaveTo method

默认情况下,它将转换它标识的第一个表 intoa表。 但是,可以通过将2传递给网页中的第二个表来进行转换 TableNumberToInclude 属性。

GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");

TableOptions options = new TableOptions();
options.TableNumberToInclude = 2;

grabzIt.URLToTable("https://www.tesla.com", options);
//Then call the Save or SaveTo method
grabzIt.SaveTo("result.csv");
GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");

TableOptions options = new TableOptions();
options.TableNumberToInclude = 2;

grabzIt.HTMLToTable("<html><body><table><tr><th>Name</th><th>Age</th></tr>
    <tr><td>Tom</td><td>23</td></tr><tr><td>Nicola</td><td>26</td></tr>
    </table></body></html>", options);
//Then call the Save or SaveTo method
grabzIt.SaveTo("result.csv");
GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");

TableOptions options = new TableOptions();
options.TableNumberToInclude = 2;

grabzIt.FileToTable("tables.html", options);
//Then call the Save or SaveTo method
grabzIt.SaveTo("result.csv");

您还可以指定 TargetElement 属性,将确保仅转换指定元素ID中的表。

GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");

TableOptions options = new TableOptions();
options.TargetElement = "stocks_table";

grabzIt.URLToTable("https://www.tesla.com", options);
//Then call the Save or SaveTo method
grabzIt.SaveTo("result.csv");
GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");

TableOptions options = new TableOptions();
options.TargetElement = "stocks_table";

grabzIt.HTMLToTable("<html><body><table id='stocks_table'><tr><th>Name</th><th>Age</th></tr>
    <tr><td>Tom</td><td>23</td></tr><tr><td>Nicola</td><td>26</td></tr>
    </table></body></html>", options);
//Then call the Save or SaveTo method
grabzIt.SaveTo("result.csv");
GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");

TableOptions options = new TableOptions();
options.TargetElement = "stocks_table";

grabzIt.FileToTable("tables.html", options);
//Then call the Save or SaveTo method
grabzIt.SaveTo("result.csv");

另外,您也可以通过将true传递给 IncludeAllTables 属性,但是仅适用于XLSX或JSON格式。 如果选择XSLX格式,则每个表都将放在生成的电子表格工作簿内的新表中。

GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");

TableOptions options = new TableOptions();
options.Format = TableFormat.xlsx;
options.IncludeAllTables = true;

grabzIt.URLToTable("https://www.tesla.com", options);
//Then call the Save or SaveTo method
grabzIt.SaveTo("result.xlsx");
GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");

TableOptions options = new TableOptions();
options.Format = TableFormat.xlsx;
options.IncludeAllTables = true;

grabzIt.HTMLToTable("<html><body><table><tr><th>Name</th><th>Age</th></tr>
    <tr><td>Tom</td><td>23</td></tr><tr><td>Nicola</td><td>26</td></tr>
    </table></body></html>", options);
//Then call the Save or SaveTo method
grabzIt.SaveTo("result.xlsx");
GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");

TableOptions options = new TableOptions();
options.Format = TableFormat.xlsx;
options.IncludeAllTables = true;

grabzIt.FileToTable("tables.html", options);
//Then call the Save or SaveTo method
grabzIt.SaveTo("result.xlsx");

将HTML表转换为JSON

GrabzIt还可以将HTML表转换为JSON,只需指定JSON格式,如下所示。 在这里,我们正在同步读取数据 into GrabzItFile 通过使用对象 SaveTo 方法,但是通常建议您执行此操作 异步 代替。

一旦得到结果,我们得到 string 通过调用JSON文件的表示形式 ToString 方法,然后可以反序列化 int使用您喜欢的JSON库的动态对象。

GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");

TableOptions options = new TableOptions();
options.Format = TableFormat.json;
options.TableNumberToInclude = 1;

grabzIt.URLToTable("https://www.tesla.com", options);

GrabzItFile file = grabzIt.SaveTo();
if (file != null)
{
    string json = file.ToString();
}
GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");

TableOptions options = new TableOptions();
options.Format = TableFormat.json;
options.TableNumberToInclude = 1;

grabzIt.HTMLToTable("<html><body><table><tr><th>Name</th><th>Age</th></tr>
    <tr><td>Tom</td><td>23</td></tr><tr><td>Nicola</td><td>26</td></tr>
    </table></body></html>", options);

GrabzItFile file = grabzIt.SaveTo();
if (file != null)
{
    string json = file.ToString();
}
GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");

TableOptions options = new TableOptions();
options.Format = TableFormat.json;
options.TableNumberToInclude = 1;

grabzIt.FileToTable("tables.html", options);

GrabzItFile file = grabzIt.SaveTo();
if (file != null)
{
    string json = file.ToString();
}

自订识别码

您可以将自定义标识符传递给 方法,如下所示,此值然后返回到您的GrabzIt ASP.NET处理程序。 例如,该自定义标识符可以是数据库标识符,从而允许将屏幕截图与特定数据库记录相关联。

GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");

TableOptions options = new TableOptions();
options.CustomId = "123456";

grabzIt.URLToTable("https://www.tesla.com", options);
//Then call the Save method
grabzIt.Save("http://www.example.com/Home/Handler");
GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");

TableOptions options = new TableOptions();
options.CustomId = "123456";

grabzIt.HTMLToTable("<html><body><h1>Hello World!</h1></body></html>", options);
//Then call the Save method
grabzIt.Save("http://www.example.com/Home/Handler");
GrabzItClient grabzIt = new GrabzItClient("Sign in to view your Application Key", "Sign in to view your Application Secret");

TableOptions options = new TableOptions();
options.CustomId = "123456";

grabzIt.FileToTable("example.html", options);
//Then call the Save method
grabzIt.Save("http://www.example.com/Home/Handler");