不能隐式地将类型arraylist转换为generic.list itextsharp.text.element [英] cannot implicitly convert type arraylist to generic.list itextsharp.text.element
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问题描述
private void generate_pdf（ string path， string file， bool download， string text）
{
var document = new Document（）;
尝试
{
如果（下载）
PdfWriter.GetInstance（document，Response.OutputStream）;
else
PdfWriter.GetInstance（document， new FileStream（path + file， FileMode.Create））;
StringBuilder strB = new StringBuilder（）;
document.Open（）;
repeat（）;
if （text.Length.Equals（ 0 ） ）
{
使用（StringWriter sw = new StringWriter（strB））
{
使用（HtmlTextWriter hw = new HtmlTextWriter（sw））
{
dt =（DataTable）会话[ dataItem];
if （dt.Rows.Count > 0 ）
{
DataRow drall;
PlaceHolder pholder = new PlaceHolder（）;
pholder.Controls.Add（ new LiteralControl（ < div>< table>< tr>< td colspan ='6'align ='center'style ='font-weight：bold; font-size：18px'> REPORT on + Text_From.Text + to + Text_To.Text + < / td>< / tr>< / table>< / div>））;
pholder.Controls.Add（ new LiteralControl（ < table border ='1'>< tr style ='background：#dadada; font-weight：bold;'>< td align ='center'> S.No< / td> ））;
pholder.Controls.Add（ new LiteralControl（ < td align ='center'>订单ID< / td>））;
pholder.Controls.Add（ new LiteralControl（ < td align ='center'>名称< / td>））;
pholder.Controls.Add（ new LiteralControl（ < td align ='center'>密码< / td>））;
pholder.Controls.Add（ new LiteralControl（ < td align ='center'> Imagename< / td>））;
pholder.Controls.Add（ new LiteralControl（ < td align ='center'>由< / td>更新））;
pholder.Controls.Add（ new LiteralControl（ < td align ='center'>图片< / td>））;
pholder.Controls.Add（ new LiteralControl（ < / TR> 中））;
for （ int i = 0 ; i < dt.Rows.Count; i ++）
{
int sno = i + 1 ;
drall = dt.Rows [i];
pholder.Controls.Add（ new LiteralControl（ < TR> 中））;
pholder.Controls.Add（ new LiteralControl（ < td> + sno + < / td> ））;
pholder.Controls.Add（ new LiteralControl（ < td> + drall [ id]。ToString（） + < / td>））;
pholder.Controls.Add（ new LiteralControl（ < td align ='right'> + drall [ username]。ToString（）+ < / td>））;
pholder.Controls.Add（ new LiteralControl（ < td align ='right'> + drall [ password]。ToString（）+ < / td>））;
pholder.Controls.Add（ new LiteralControl（ < td align ='right'> + drall [ imagename]。ToString（）+ < / td>））;
pholder.Controls.Add（ new LiteralControl（ < td align ='right'> + drall [ updatedby]。ToString（）+ < / td>））;
pholder.Controls.Add（ new LiteralControl（ < td align ='right'> + drall [ uploadimage]。ToString（）+ < / td>））;
pholder.Controls.Add（ new LiteralControl（ < / TR> 中））;
}
pholder.Controls.Add（ new LiteralControl（ < / table>））;
pholder.RenderControl（hw）;
}
}
}
}
else
strB.Append（text）;
使用（TextReader sReader = new StringReader（strB.ToString（）） ）
{
List< IElement> list = HTMLWorker.ParseToList（sReader， new StyleSheet（））; // 这里我收到错误
foreach （IElement elm in list）
{
document.Add（elm）;
}
}
}
catch （例外情况）
{
}
finally
{
document.Close（）;
}
}
受保护 void btn_pdf_Click（ object sender，EventArgs e）
{
try
{
string file = 报告 + DateTime.Now.Ticks + 。pdf;
Response.Clear（）;
generate_pdf（ ，file， true ， ）;
Response.ContentType = application / pdf;
Response.AddHeader（ content-disposition， attachment; filename = + file）;
Response.Flush（）;
Response.End（）;
}
catch （例外情况）
{
throw ex;
}
}
解决方案
尝试下面的代码
< pre lang =c＃> List< IElement> list = HTMLWorker.ParseToList（sReader， new StyleSheet（））。Cast< IElement>（）。ToList（）;
private void generate_pdf(string path, string file, bool download, string text)
{
var document = new Document();
try
{
if (download)
PdfWriter.GetInstance(document, Response.OutputStream);
else
PdfWriter.GetInstance(document, new FileStream(path + file, FileMode.Create));
StringBuilder strB = new StringBuilder();
document.Open();
repeat();
if (text.Length.Equals(0))
{
using (StringWriter sw = new StringWriter(strB))
{
using (HtmlTextWriter hw = new HtmlTextWriter(sw))
{
dt = (DataTable)Session["dataItem"];
if (dt.Rows.Count > 0)
{
DataRow drall;
PlaceHolder pholder = new PlaceHolder();
pholder.Controls.Add(new LiteralControl("<div ><table><tr><td colspan='6' align='center' style='font-weight:bold;font-size:18px'>REPORT on " + Text_From.Text + " to " + Text_To.Text + "</td></tr></table></div>"));
pholder.Controls.Add(new LiteralControl("<table border='1'><tr style='background:#dadada;font-weight:bold;'><td align='center'>S.No</td>"));
pholder.Controls.Add(new LiteralControl("<td align='center'>Order ID</td>"));
pholder.Controls.Add(new LiteralControl("<td align='center'>Name</td>"));
pholder.Controls.Add(new LiteralControl("<td align='center'>Password</td>"));
pholder.Controls.Add(new LiteralControl("<td align='center'>Imagename</td>"));
pholder.Controls.Add(new LiteralControl("<td align='center'>Updated by</td>"));
pholder.Controls.Add(new LiteralControl("<td align='center'>Image</td>"));
pholder.Controls.Add(new LiteralControl("</tr>"));
for (int i = 0; i < dt.Rows.Count; i++)
{
int sno = i + 1;
drall = dt.Rows[i];
pholder.Controls.Add(new LiteralControl("<tr>"));
pholder.Controls.Add(new LiteralControl("<td >" + sno + "</td>"));
pholder.Controls.Add(new LiteralControl("<td>" + drall["id"].ToString() + "</td>"));
pholder.Controls.Add(new LiteralControl("<td align='right'>" + drall["username"].ToString() + "</td>"));
pholder.Controls.Add(new LiteralControl("<td align='right'>" + drall["password"].ToString() + "</td>"));
pholder.Controls.Add(new LiteralControl("<td align='right'>" + drall["imagename"].ToString() + "</td>"));
pholder.Controls.Add(new LiteralControl("<td align='right'>" + drall["updatedby"].ToString() + "</td>"));
pholder.Controls.Add(new LiteralControl("<td align='right'>" + drall["uploadimage"].ToString() + "</td>"));
pholder.Controls.Add(new LiteralControl("</tr>"));
}
pholder.Controls.Add(new LiteralControl("</table>"));
pholder.RenderControl(hw);
}
}
}
}
else
strB.Append(text);
using (TextReader sReader = new StringReader(strB.ToString()))
{
List<IElement> list = HTMLWorker.ParseToList(sReader, new StyleSheet()); // here i got error
foreach (IElement elm in list)
{
document.Add(elm);
}
}
}
catch (Exception ex)
{
}
finally
{
document.Close();
}
}
protected void btn_pdf_Click(object sender, EventArgs e)
{
try
{
string file = "reports" + DateTime.Now.Ticks + ".pdf";
Response.Clear();
generate_pdf("", file, true, "");
Response.ContentType = "application/pdf";
Response.AddHeader("content-disposition", "attachment; filename=" + file);
Response.Flush();
Response.End();
}
catch(Exception ex)
{
throw ex;
}
} 解决方案
try below code
List<IElement> list = HTMLWorker.ParseToList(sReader, new StyleSheet()).Cast<IElement>().ToList();
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