MOSS 2007, C#, Web Part - Log Retrievel Linkbuttons mit

Question

Technologie: Sharepoint/MOSS 2007 - IDE: Visual Studio 2008 - Sprache: C#

ich eine Sharepoint erstellt haben/MOSS 2007 Webpart Zeigt eine Liste der Protokolldateien an. Die Protokolldateien werden auf dem Bildschirm als LinkButtons gerendert. Die LinkButtons befinden sich in einer DataTable, die als Datenquelle einer SPGridView festgelegt und an sie gebunden ist. Dieses SPGridView-Objekt wird dann den Steuerelementen innerhalb der überschriebenen Methode "CreateChildControls()" des Webparts hinzugefügt.

Ich verwende die folgende Helper-Klasse "DownloadAssistant", um eine bestimmte Datei anzuzeigen. Es ist "DownloadFile" -Methode aus dem '.Click' Ereignis jedes LinkButton aufgerufen.

using System; 
using System.Web; 

/// <summary> 
/// A class that helps to build download buttons/links on the fly 
/// </summary> 
static public class DownloadAssistant 
{ 
    static public void DownloadFile(string filePath) 
    { 
     try 
     { 
      HttpContext.Current.Response.Clear(); 
      HttpContext.Current.Response.AddHeader("Content-Disposition", string.Concat("attachment; filename=", filePath)); 
      HttpContext.Current.Response.ContentType = "application/octet-stream"; 
      HttpContext.Current.Response.WriteFile(filePath); 
      HttpContext.Current.Response.Flush(); 
      HttpContext.Current.Response.End(); 
     } 
     catch (Exception ex) 
     { 
      throw ex; 
     } 
    } 
} 

Nach einem Linkbutton auf dem Bildschirm geklickt wird, erhalte ich die Download-Fenster öffnet sich wie erwartet und kann die erste Protokolldatei gehen Sie vor und öffnen. Nachdem jedoch diese erste Protokolldatei geöffnet wurde, d. H. Nachdem das erste LinkButton-Klickereignis ausgelöst wurde, kann ich kein anderes .Click-Ereignis auslösen - es ist so, wie ich es zurück auf den Bildschirm schreiben muss. Wenn ich auf eine der anderen LinkButtons klicke, passiert nichts.

Der Web-Part-Code:

namespace LogRetrievalWebPart 
{ 
    [Guid("fd243ec2-83e3-4bad-af5e-c5c16acbc6dd")] 
    public class LogRetrievalWebPart : System.Web.UI.WebControls.WebParts.WebPart 
    { 
     // Member variables prefixed with "m_" 
     private Label m_InfoLbl; 
     private SPGridView m_GridView; 
     private DataTable m_LogFileDataTable; 
     private DropDownList m_DirectoryDropDown; 


     private const String DROPDOWN_OPTION_DEFAULT = "---"; 
     private const String DROPDOWN_OPTION_TRACE_LOGS = "Trace Logs"; 
     private const String DROPDOWN_OPTION_BATCH_LOGS = "Batch Logs"; 
     private const String DROPDOWN_OPTION_OTHER_LOGS = "Other Logs"; 

     public LogRetrievalWebPart() 
     { 
      this.ExportMode = WebPartExportMode.All; 
     } 

     protected override void CreateChildControls() 
     { 
      EnsureChildControls(); 

      base.CreateChildControls(); 

      m_InfoLbl = new Label(); 
      Label dropDownLbl = new Label(); 
      dropDownLbl.Text = " Please select a directory: "; 
      this.Controls.Add(dropDownLbl); 


      m_DirectoryDropDown = new DropDownList(); 
      m_DirectoryDropDown.Items.Add(DROPDOWN_OPTION_DEFAULT); 
      m_DirectoryDropDown.Items.Add(DROPDOWN_OPTION_TRACE_LOGS); 
      m_DirectoryDropDown.Items.Add(DROPDOWN_OPTION_BATCH_LOGS); 
      m_DirectoryDropDown.Items.Add(DROPDOWN_OPTION_OTHER_LOGS); 
      m_DirectoryDropDown.TextChanged += new EventHandler(directoryDropdown_TextChanged); 
      m_DirectoryDropDown.AutoPostBack = true; 

      m_LogFileDataTable = new DataTable("LogFiles"); 
      AddColums(); 

      m_GridView = new SPGridView(); 
      m_GridView.AutoGenerateColumns = false; 

      BoundField idField = new BoundField(); 
      idField.DataField = "ID"; 
      idField.HeaderText = "ID"; 
      m_GridView.Columns.Add(idField); 

      TemplateField colName = new TemplateField(); 
      colName.HeaderText = "Log File Name"; 
      colName.SortExpression = "LogFileName"; 
      colName.ItemTemplate = new LinkTemplate("LogFileName", "Path"); 
      m_GridView.Columns.Add(colName); 

      this.Controls.Add(m_DirectoryDropDown); 
      this.Controls.Add(m_InfoLbl); 
      this.Controls.Add(m_GridView); 

      this.Load += new EventHandler(LogRetrievalWebPart_Load); 
      this.PreRender += new EventHandler(LogRetrievalWebPart_PreRender); 
     } 

    void LogRetrievalWebPart_Load(object sender, EventArgs e) 
    { 
     EnsureChildControls(); 
    } 

    protected void directoryDropdown_TextChanged(object sender, EventArgs e) 
    { 
     ViewState["LogRetrieval"] = null; 
     String selectedDirectoryName = m_DirectoryDropDown.SelectedItem.Text; 

     if (DROPDOWN_OPTION_TRACE_LOGS.Equals(selectedDirectoryName)) 
     { 
      m_InfoLbl.Text = " *** TRACE Logs: *** "; 
      GetLogFiles("LogFiles/TraceLogs"); 
     } 
     else if (DROPDOWN_OPTION_BATCH_LOGS.Equals(selectedDirectoryName)) 
     { 
      m_InfoLbl.Text = " *** BATCH Logs: *** "; 
      GetLogFiles("PortalExecutables/Logs"); 
     } 
     else if (DROPDOWN_OPTION_OTHER_LOGS.Equals(selectedDirectoryName)) 
     { 
      m_InfoLbl.Text = " *** OTHER Logs: *** "; 
      GetLogFiles("PortalExecutables/GMExecutables"); 
     } 
     else 
     { 
      m_InfoLbl.Text = " *** No Logs to display for this selection!!! *** "; 
     } 

     ViewState["LogRetrieval"] = m_LogFileDataTable; 
     m_GridView.DataSource = m_LogFileDataTable; 
     m_GridView.DataBind(); 
    } 

    private void GetLogFiles(string aSelectedDirectory) 
    { 
     string directoryPath = HttpContext.Current.Server.MapPath(ResolveUrl("/LogFiles/" + aSelectedDirectory)); 

     DirectoryInfo directory = new DirectoryInfo(directoryPath); 
     FileInfo[] files = directory.GetFiles(); 

     int count = 1; 
     foreach (FileInfo fileInfo in files) 
     { 
      string fullFileName = fileInfo.FullName; 
      string fileName = fileInfo.ToString(); 

      AddRow(count, fileName, fullFileName); 
      count++; 
     } 
    } 

    private void AddRow(int id, string logFileName, string fullFileName) 
    { 
     DataRow newRow = m_LogFileDataTable.Rows.Add(); 
     newRow["ID"] = id; 
     newRow["LogFileName"] = logFileName; 
     newRow["Path"] = fullFileName; 
    } 

    private void AddColums() 
    { 
     DataColumn idCol = m_LogFileDataTable.Columns.Add("ID", typeof(Int32)); 
     idCol.Unique = true; 

     m_LogFileDataTable.Columns.Add("LogFileName", typeof(String)); 
     m_LogFileDataTable.Columns.Add("Path", typeof(String)); 
    } 

    public void LogRetrievalWebPart_PreRender(object sender, EventArgs e) 
    { 
     if (this.Page.IsPostBack) 
     { 
      if (ViewState["LogRetrieval"] != null) 
      { 
       m_LogFileDataTable = (DataTable)ViewState["LogRetrieval"]; 
       m_GridView.DataSource = m_LogFileDataTable; 
       m_GridView.DataBind(); 
      } 
     } 
    } 

    public class LinkTemplate : ITemplate 
    { 
     string logFileName; 
     string logFilePath; 

     public LinkTemplate(string fieldName, string path) 
     { 
      logFileName = fieldName; 
      logFilePath = path; 
     } 

     public void InstantiateIn(Control container) 
     { 
      LinkButton link = new LinkButton(); 
      container.Controls.Add(link); 

      link.DataBinding += new EventHandler(link_DataBinding); 
      link.Click += new EventHandler(link_Click); 
     } 

     private void link_DataBinding(Object sender, EventArgs e) 
     { 
      LinkButton link = (LinkButton)sender; 
      DataRowView dataRow = (DataRowView)((SPGridViewRow)link.NamingContainer).DataItem; 

      link.Text = dataRow[logFileName].ToString(); 
      link.CommandArgument = dataRow[logFilePath].ToString(); 
     } 

     private void link_Click(object sender, EventArgs e) 
     { 
      LinkButton link = (LinkButton)sender; 
      DownloadAssistant.DownloadFile(link.CommandArgument); 
     } 
    } 
} 
} 

Answer 1

fand ich eine Lösung. musste ich:

1. Stellen Sie die clientseitige Klick-Ereignis der Schaltfläche zu: "exportRequested = true;"
2. Registrieren Sie die einige JavaScript: Genaue Angaben dazu finden Sie unter:

http://social.msdn.microsoft.com/Forums/en-US/sharepointdevelopment/thread/55136e4e-e1f7-4a79-9b75-be09cd5594c2