SharePoint 2013 运行时 "Could not load file or assembly 'Select.HtmlToPdf, Version=2.4.0.1" 错误。使用 Select.HtmlToPdf 第 3 方库

Question

我的错误：

Could not load file or assembly 'Select.HtmlToPdf, Version=2.4.0.1, Culture=neutral, PublicKeyToken=e0ae9f6e27a97018' or one of its dependencies. The system cannot find the file specified.

到目前为止，我已经创建了我的 webpart 并通过此命令安装了 Select.HtmlToPdf 包 "PM> Install-Package Select.HtmlToPdf " (https://www.nuget.org/packages/Select.HtmlToPdf/)

我在部署时没有错误，只有在 运行 时。尽管一切看起来都很好并且对我来说就位，但这个错误不会消失。我是不是做错了什么或遗漏了什么？

编辑：仅当我在 SharePoint 2013（Visual WebPart）

上尝试 运行 Select.HtmlToPdf 时才会出现此错误

我的代码：

using SelectPdf;
using System;
using System.Data;
using System.IO;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

namespace downloadPDF.VisualWebPart1
{
    public partial class VisualWebPart1UserControl : UserControl
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                GetRecord();
            }
        }
        private bool startConversion = false;
        private void GetRecord()
        {
            DataTable dt = new DataTable();
            dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id", typeof(int)),
                            new DataColumn("Name", typeof(string)),
                            new DataColumn("Country",typeof(string)) });
            dt.Rows.Add(1, "John Hammond", "United States");
            dt.Rows.Add(2, "Mudassar Khan", "India");
            dt.Rows.Add(3, "Suzanne Mathews", "France");
            dt.Rows.Add(4, "Robert Schidner", "Russia");
            GridView1.DataSource = dt;
            GridView1.DataBind();
        }
        protected void Button1_Click(object sender, EventArgs e)
        {
            startConversion = true;
        }
        protected override void Render(HtmlTextWriter writer)
        {
            if (startConversion)
            {
                // get html of the page
                TextWriter myWriter = new StringWriter();
                HtmlTextWriter htmlWriter = new HtmlTextWriter(myWriter);
                base.Render(htmlWriter);

                // instantiate a html to pdf converter object
                HtmlToPdf converter = new HtmlToPdf();

                // create a new pdf document converting the html string of the page
                PdfDocument doc = converter.ConvertHtmlString(
                    myWriter.ToString(), Request.Url.AbsoluteUri);

                // save pdf document
                doc.Save(Response, false, "Sample.pdf");

                // close pdf document
                doc.Close();
            }
            else
            {
                // render web page in browser
                base.Render(writer);
            }
        }
    }
}

Answer 1

对于任何使用第 3 方库的 SharePoint WebPart，解决方案是将该库添加到 GAC：

单击 Package.package > 高级 > 添加 > 从现有程序集添加 > 选定 Select.HtmlToPdf.dll > 将部署目标选中为 GAC > 保存！

此处有更多详细信息：https://social.msdn.microsoft.com/Forums/office/en-US/0b9ef307-e15c-4bc1-b5c0-dfc7aef04900/deploying-third-party-dll-from-solution?forum=sharepointdevelopmentprevious

Answer 2

正如汤姆所说，我向 GAC 添加了 Select.PdfToHtml.dll 库。

“我尝试在 GAC 中添加 Select.HtmlToPdf.dll 文件，它非常有效。我双击 Package.package > 高级 > 添加 > 从现有程序集添加 > 选择我的 Select.HtmlToPdf.dll(Net20) > 检查部署目标为 GAC > 保存！ 参考资料：add library to GAC Could not load file or assembly Select.HtmlToPdf“

之后，我可以加载我的页面并查看我的内容。但是当我点击按钮时；我收到这个错误

"Conversion failure. Could not find 'Select.Html.dep'. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code."

要解决此问题，请执行以下步骤：

firstly I copied my Select.Html.Dep file(Net20) to my 15 hive folder "\TEMPLATE\CONTROLTEMPLATES\SelectPDFTest\VisualWebPart1\Select.Html.Dep"

then I set my full path like this in Code:

"// create a new pdf document converting the html string of the page SelectPdf.GlobalProperties.HtmlEngineFullPath = @"C:\Program Files\Common Files\microsoft shared\Web Server Extensions\TEMPLATE\CONTROLTEMPLATES\SelectPDFTest\VisualWebPart1\Select.Html.dep"; PdfDocument doc = converter.ConvertHtmlString(myWriter.ToString(), Request.Url.AbsoluteUri);" Reference: Could not load file or assembly Select.HtmlToPdf

所以最后，我的代码如下所示：

using SelectPdf;
using System;
using System.Data;
using System.IO;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;

namespace SelectPDFTest.VisualWebPart1
{
    public partial class VisualWebPart1UserControl : UserControl
    {

        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                GetRecord();
            }
        }
        private bool startConversion = false;
        private void GetRecord()
        {
            DataTable dt = new DataTable();
            dt.Columns.AddRange(new DataColumn[3] { new DataColumn("Id", typeof(int)),
                            new DataColumn("Name", typeof(string)),
                            new DataColumn("Country",typeof(string)) });
            dt.Rows.Add(1, "John Hammond", "United States");
            dt.Rows.Add(2, "Mudassar Khan", "India");
            dt.Rows.Add(3, "Suzanne Mathews", "France");
            dt.Rows.Add(4, "Robert Schidner", "Russia");
            GridView1.DataSource = dt;
            GridView1.DataBind();
        }
        protected void Button1_Click(object sender, EventArgs e)
        {
            startConversion = true;
        }
        protected override void Render(HtmlTextWriter writer)
        {
            if (startConversion)
            {
                // get html of the page
                TextWriter myWriter = new StringWriter();

                HtmlTextWriter htmlWriter = new HtmlTextWriter(myWriter);
                base.Render(htmlWriter);

                // instantiate a html to pdf converter object
                HtmlToPdf converter = new HtmlToPdf();

                // set css @media screen
                converter.Options.CssMediaType = HtmlToPdfCssMediaType.Screen;

                // create a new pdf document converting the html string of the page
                SelectPdf.GlobalProperties.HtmlEngineFullPath = @"C:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\TEMPLATE\CONTROLTEMPLATES\SelectPDFTest\VisualWebPart1\Select.Html.dep";

                string css = "<link rel='stylesheet' href='/Style Library/css/main.css' media='screen' />   ";
                string pageHtml = css + myWriter.ToString();

                PdfDocument doc = converter.ConvertHtmlString(pageHtml, Request.Url.AbsoluteUri);

                // save pdf document
                doc.Save(Response, false, "Sample.pdf");

                // close pdf document
                doc.Close();

                startConversion = false;
            }
            else
            {
                // render web page in browser
                base.Render(writer);
            }
        }
    }
}