将gridview转换为图像

Question

我想将gridview转换成图像并将其保存到asp.net 3.5中的本地磁盘。我不知道该怎么做。

任何人都可以请建议一些东西。

在此先感谢。

Answer 1

为什么你想将它转换成图像，我不确定。如果gridview有分页，你必须像这样捕获每个页面。更好的方法是将其导出为类似Excel或其他东西。这里是代码做到这一点：

using System; 
using System.Data; 
using System.Configuration; 
using System.IO; 
using System.Web; 
using System.Web.Security; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Web.UI.WebControls.WebParts; 
using System.Web.UI.HtmlControls; 

public class GridViewExportUtil 
{ 
    /// <summary> 
    /// 
    /// </summary> 
    /// <param name="fileName"></param> 
    /// <param name="gv"></param> 
    public static void Export(string fileName, GridView gv) 
    { 
     HttpContext.Current.Response.Clear(); 
     HttpContext.Current.Response.AddHeader(
      "content-disposition", string.Format("attachment; filename={0}", fileName)); 
     HttpContext.Current.Response.ContentType = "application/ms-excel"; 

     using (StringWriter sw = new StringWriter()) 
     { 
      using (HtmlTextWriter htw = new HtmlTextWriter(sw)) 
      { 
       // Create a table to contain the grid 
       Table table = new Table(); 

       // include the gridline settings 
       table.GridLines = gv.GridLines; 

       // add the header row to the table 
       if (gv.HeaderRow != null) 
       { 
        GridViewExportUtil.PrepareControlForExport(gv.HeaderRow); 
        table.Rows.Add(gv.HeaderRow); 
       } 

       // add each of the data rows to the table 
       foreach (GridViewRow row in gv.Rows) 
       { 
        GridViewExportUtil.PrepareControlForExport(row); 
        table.Rows.Add(row); 
       } 

       // add the footer row to the table 
       if (gv.FooterRow != null) 
       { 
        GridViewExportUtil.PrepareControlForExport(gv.FooterRow); 
        table.Rows.Add(gv.FooterRow); 
       } 

       // render the table into the htmlwriter 
       table.RenderControl(htw); 

       // render the htmlwriter into the response 
       HttpContext.Current.Response.Write(sw.ToString()); 
       HttpContext.Current.Response.End(); 
      } 
     } 
    } 

    /// <summary> 
    /// Replace any of the contained controls with literals 
    /// </summary> 
    /// <param name="control"></param> 
    private static void PrepareControlForExport(Control control) 
    { 
     for (int i = 0; i < control.Controls.Count; i++) 
     { 
      Control current = control.Controls[i]; 
      if (current is LinkButton) 
      { 
       control.Controls.Remove(current); 
       control.Controls.AddAt(i, new LiteralControl((current as LinkButton).Text)); 
      } 
      else if (current is ImageButton) 
      { 
       control.Controls.Remove(current); 
       control.Controls.AddAt(i, new LiteralControl((current as ImageButton).AlternateText)); 
      } 
      else if (current is HyperLink) 
      { 
       control.Controls.Remove(current); 
       control.Controls.AddAt(i, new LiteralControl((current as HyperLink).Text)); 
      } 
      else if (current is DropDownList) 
      { 
       control.Controls.Remove(current); 
       control.Controls.AddAt(i, new LiteralControl((current as DropDownList).SelectedItem.Text)); 
      } 
      else if (current is CheckBox) 
      { 
       control.Controls.Remove(current); 
       control.Controls.AddAt(i, new LiteralControl((current as CheckBox).Checked ? "True" : "False")); 
      } 

      if (current.HasControls()) 
      { 
       GridViewExportUtil.PrepareControlForExport(current); 
      } 
     } 
    } 
} 

只需调用静态导出方法与XLS文件的名称和GridView控件：

GridViewExportUtil.Export("MyFile.XLS", myGridView); 

Answer 2

以下链接可以帮助你：

Convert a DataGridView to a Bitmap

Exporting a DataGridView to an Excel/PDF/image file by using Reporting Services report generation - CodeProject

Answer 3

你可以使用Java小程序。检查以下网址：

Is there a way to take a screenshot using java and save it to some sort of image?