infopath附件类型限制和重名限制

      infopath表单提供附件节点，很利于我们进行附件添加,可是当Infopath兼容浏览器以后不好的事情发生了.不支持用条件格式对文件类型进行限制。假如我们需要把文件的附件保存到SPList的某个文件夹下，重名的判断又是一个问题。

    我这里假设的提交是我有一个主文件上载区（MainFile节点），一个辅助文件上载区（AttachGroup重复组），主文件仅限一个，且限制为.doc或者.docx格式的文件,辅助文件允许多个,可以是 xls,xlsx，doc，docx文件类型。

三个赋值方法

Code
  public enum FileType
        {
            MainFile,
            AttachFile
        }

        public bool checkFileType(XPathNavigator xpNode, XPathNavigator xpErrorMessage, FileType fileType)
        {

            bool hasCan = false;
            try
            {
                InfoPathAttachmentDecoder decoder = new InfoPathAttachmentDecoder(xpNode.Value);
                string fileName = decoder.Filename;
                string fileNameender = fileName.Substring(fileName.LastIndexOf('.') + 1);
                string[] permissions = null;
                string ErrorMessage = string.Empty;
                if (fileType == FileType.MainFile)
                {
                    ErrorMessage += "呈文文件";
                    permissions = new string[] { "doc", "docx" };
                }
                else
                {
                    ErrorMessage += "呈文附件";
                    permissions = new string[] { "doc", "docx", "xls", "xlsx" };
                }

                foreach (string str in permissions)
                {
                    if (str.Equals(fileNameender))
                    {
                        hasCan = true;
                    }
                }

                if (!hasCan)
                {
                    ErrorMessage += "只能是\t";
                    ErrorMessage += fileType == FileType.MainFile ? "doc,docx" : "doc,docx,xls,xlsx";
                    ErrorMessage += "\t的文件类型";
                    xpErrorMessage.SetValue(ErrorMessage);
                }
            }
            catch (Exception ex)
            {
                xpErrorMessage.SetValue(ex.Message);
                return false;
            }
            return hasCan;
        }


        public bool CheckUploadFileNames(XPathNavigator xpMainFile, XPathNavigator xpGroup, XPathNavigator xpErrorMessage)
        {
            try
            {
                string fileName = string.Empty;
                InfoPathAttachmentDecoder decoder = null;
                string ErrorMessage = string.Empty;
                char splitchar = ',';

                List<string> listFileNames = new List<string>();
                if (!string.IsNullOrEmpty(xpMainFile.Value))
                {
                    decoder = new InfoPathAttachmentDecoder(xpMainFile.Value);
                    if (listFileNames.Contains(decoder.Filename))
                    {
                        ErrorMessage += decoder.Filename + splitchar;
                    }
                    else
                    {
                        listFileNames.Add(decoder.Filename);
                    }
                }

                XPathNodeIterator xpIter = xpGroup.SelectChildren(XPathNodeType.Element);
                while (xpIter.MoveNext())
                {
                    XPathNavigator xpCurrent = xpIter.Current.Clone();

                    if (xpCurrent.MoveToChild(XPathNodeType.Element) && !string.IsNullOrEmpty(xpCurrent.Value))
                    {
                        decoder = new InfoPathAttachmentDecoder(xpCurrent.Value);
                        if (listFileNames.Contains(decoder.Filename))
                        {
                            ErrorMessage += ErrorMessage.Contains(decoder.Filename + splitchar) ? string.Empty : decoder.Filename + splitchar;
                        }
                        else
                        {
                            listFileNames.Add(decoder.Filename);
                        }
                    }
                }

                if (!string.IsNullOrEmpty(ErrorMessage))
                {
                    xpErrorMessage.SetValue(ErrorMessage + "\t重复上传");
                    return false;
                }

            }
            catch (Exception ex)
            {
                xpErrorMessage.SetValue(ex.Message);
                return false;
            }
            return true;
        }


        public bool CheckFileTypeAndNames(XPathNavigator xpMainFile, XPathNavigator xpGroup, XPathNavigator xpErrorMessage)
        {
            if (!string.IsNullOrEmpty(xpMainFile.Value))
            {
                if (!checkFileType(xpMainFile, xpErrorMessage, FileType.MainFile))
                {
                    return false;
                }
            }

            XPathNodeIterator xpIter = xpGroup.SelectChildren(XPathNodeType.Element);
            while (xpIter.MoveNext())
            {
                XPathNavigator xpCurrent = xpIter.Current.Clone();

                if (xpCurrent.MoveToChild(XPathNodeType.Element) &&  string .IsNullOrEmpty (xpCurrent .Value) )
                {
                    if (!checkFileType(xpCurrent, xpErrorMessage, FileType.AttachFile))
                    {
                        return false;
                    }
                }
            }
            if (!CheckUploadFileNames(xpMainFile, xpGroup, xpErrorMessage))
            {
                return false;
            }
            return true;
        }
    }

使用

Code
     public void AttachFile_Changed(object sender, XmlEventArgs e)
        {
            // 在此处编写代码，用于更改主数据源。
            if (!string.IsNullOrEmpty(e.NewValue))
            {
                XmlNamespaceManager ns = this.NamespaceManager;
                XPathNavigator xpRoot = this.MainDataSource.CreateNavigator();
                XPathNavigator xpErrorMessage = xpRoot.SelectSingleNode("my:myFields/my:ErrorMessage", ns);
                xpErrorMessage.SetValue(string.Empty);

                if (!checkFileType(e.Site, xpErrorMessage, FileType.AttachFile))
                {
                    return;
                }

                XPathNavigator xpMainFile = xpRoot.SelectSingleNode("my:myFields/my:MainFile", ns);
                XPathNavigator xpAttachGroup = xpRoot.SelectSingleNode("my:myFields/my:AttachGroup", ns);
                if (!CheckUploadFileNames(xpMainFile, xpAttachGroup, xpErrorMessage))
                {                   
                    return;
                }                
            }
        }

        public void MainFile_Changed(object sender, XmlEventArgs e)
        {
            // 在此处编写代码，用于更改主数据源。
            if (!string.IsNullOrEmpty(e.NewValue))
            {
                XmlNamespaceManager ns = this.NamespaceManager;
                XPathNavigator xpRoot = this.MainDataSource.CreateNavigator();
                XPathNavigator xpErrorMessage = xpRoot.SelectSingleNode("my:myFields/my:ErrorMessage", ns);
                xpErrorMessage.SetValue(string.Empty);
                if (!checkFileType(e.Site, xpErrorMessage, FileType.MainFile))
                {
                    return;
                }

                XPathNavigator xpMainFile = xpRoot.SelectSingleNode("my:myFields/my:MainFile", ns);
                XPathNavigator xpAttachGroup = xpRoot.SelectSingleNode("my:myFields/my:AttachGroup", ns);
                if (!CheckUploadFileNames(xpMainFile, xpAttachGroup, xpErrorMessage))
                {
                    this.Errors.Add(e.Site, e.Site.ToString(), xpErrorMessage.Value);
                    return;
                }
            }
        }

        public void CTRL17_5_Clicked(object sender, ClickedEventArgs e)
        {
            // 在此处编写代码，用于更改主数据源。

            XmlNamespaceManager ns = this.NamespaceManager;
            XPathNavigator xpRoot = this.MainDataSource.CreateNavigator();
            XPathNavigator xpErrorMessage = xpRoot.SelectSingleNode("my:myFields/my:ErrorMessage", ns);
            XPathNavigator xpMainFile = xpRoot.SelectSingleNode("my:myFields/my:MainFile", ns);
            XPathNavigator xpAttachGroup = xpRoot.SelectSingleNode("my:myFields/my:AttachGroup", ns);
            xpErrorMessage.SetValue(string.Empty);

            if (!CheckFileTypeAndNames(xpMainFile, xpAttachGroup, xpErrorMessage))
            {
                return;
            }

        }

源码下载 

/Files/mouse_in_beijing/源码.rar