以字符串形式获取页面的 HTML

本文关键字：HTML 获取 字符串 | 更新日期: 2023-09-27 18:34:28

我正在尝试在完成加载时将页面的html作为字符串获取：

    protected void OnPreRenderComplete(object sender, EventArgs e)
    {
        StringWriter strWrt = new StringWriter();
        HtmlTextWriter htmText = new HtmlTextWriter(strWrt);
        base.Render(htmText);
        html = strWrt.GetStringBuilder();
    }

但是，这会导致 html 字符串为空...所以它不拉。我也尝试在渲染上执行此操作：

    protected override void Render(HtmlTextWriter writer)
    {
        StringWriter strWrt = new StringWriter();
        HtmlTextWriter htmText = new HtmlTextWriter(strWrt);
        base.Render(htmText);
        html = strWrt.GetStringBuilder();
    }

但是当我这样做时，页面不会呈现。我做错了什么？

以字符串形式获取页面的 HTML

我认为页面没有呈现，因为您没有对 writer 参数执行任何操作。不过，你不能只用HtmlTextWriter的每个实例来调用Render，所以需要另一种方法。

以下部分 TextWriter 实现允许我捕获 html，并呈现页面。可能还有其他 Write 方法需要重载才能完成解决方案......

...
    protected override void Render(HtmlTextWriter writer)
    {
        var stringWriter = new TextWriterDecorator(writer.InnerWriter);
        writer.InnerWriter = stringWriter;
        base.Render(writer);
        var html = stringWriter.GetStringBuilder();
    }
}
public class TextWriterDecorator : StringWriter
{
    readonly TextWriter writer;
    public TextWriterDecorator(TextWriter writer)
    {
        this.writer = writer;
    }
    public override void Write(char value)
    {
        this.writer.Write(value);
        base.Write(value);
    }
    public override void Write(char[] buffer)
    {
        this.writer.Write(buffer);
        base.Write(buffer);
    }
    public override void Write(char[] buffer, int index, int count)
    {
        this.writer.Write(buffer, index, count);
        base.Write(buffer, index, count);
    }
    public override void Write(string format)
    {
        this.writer.Write(format);
        base.Write(format);
    }
}
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