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C# 打开文件，打开文件夹对话框

1、打开文件对话框

  OpenFileDialog ofd = new OpenFileDialog();ofd.InitialDirectory = "c:\\";ofd.Multiselect = true;ofd.Filter = "(*.jpg,*.png,*.jpeg,*.bmp)|*.jgp;*.png;*.jpeg;*.bmp;";if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK){var ofdFileNames = ofd.FileNames;}else{"取消选择!".MsgInfo();}

2、打开文件夹对话框

  FolderBrowserDialog folder = new FolderBrowserDialog();folder.Description = "图像文件所在目录";  //定义在对话框上显示的文本folder.RootFolder = Environment.SpecialFolder.Desktop;if (folder.ShowDialog() == System.Windows.Forms.DialogResult.OK){var sPath = folder.SelectedPath;}

3、打开文件夹对话框

var commonOpenFileDialog = new CommonOpenFileDialog();
commonOpenFileDialog.Multiselect = true;
commonOpenFileDialog.IsFolderPicker = true;
commonOpenFileDialog.InitialDirectory = "c:\\";
commonOpenFileDialog.RestoreDirectory = true;
commonOpenFileDialog.ShowDialog();

4、自定义打开文件夹对话框

1、自定义类

/// <summary>/// Wraps System.Windows.Forms.OpenFileDialog to make it present/// a vista-style dialog./// </summary>public class FolderSelectDialog{// Wrapped dialogSystem.Windows.Forms.OpenFileDialog ofd = null;/// <summary>/// Default constructor/// </summary>public FolderSelectDialog(){ofd = new System.Windows.Forms.OpenFileDialog();ofd.Filter = "Folders|\n";ofd.AddExtension = false;ofd.CheckFileExists = false;ofd.DereferenceLinks = true;ofd.Multiselect = false;}#region Properties/// <summary>/// Gets/Sets the initial folder to be selected. A null value selects the current directory./// </summary>public string InitialDirectory{get { return ofd.InitialDirectory; }set { ofd.InitialDirectory = value == null || value.Length == 0 ? Environment.CurrentDirectory : value; }}/// <summary>/// Gets/Sets the title to show in the dialog/// </summary>public string Title{get { return ofd.Title; }set { ofd.Title = value == null ? "Select a folder" : value; }}/// <summary>/// Gets the selected folder/// </summary>public string FileName{get { return ofd.FileName; }}#endregion#region Methods/// <summary>/// Shows the dialog/// </summary>/// <returns>True if the user presses OK else false</returns>public bool ShowDialog(){return ShowDialog(IntPtr.Zero);}/// <summary>/// Shows the dialog/// </summary>/// <param name="hWndOwner">Handle of the control to be parent</param>/// <returns>True if the user presses OK else false</returns>public bool ShowDialog(IntPtr hWndOwner){bool flag = false;if (Environment.OSVersion.Version.Major >= 6){var r = new Reflector("System.Windows.Forms");uint num = 0;Type typeIFileDialog = r.GetType("FileDialogNative.IFileDialog");object dialog = r.Call(ofd, "CreateVistaDialog");r.Call(ofd, "OnBeforeVistaDialog", dialog);uint options = (uint)r.CallAs(typeof(System.Windows.Forms.FileDialog), ofd, "GetOptions");options |= (uint)r.GetEnum("FileDialogNative.FOS", "FOS_PICKFOLDERS");r.CallAs(typeIFileDialog, dialog, "SetOptions", options);object pfde = r.New("FileDialog.VistaDialogEvents", ofd);object[] parameters = new object[] { pfde, num };r.CallAs2(typeIFileDialog, dialog, "Advise", parameters);num = (uint)parameters[1];try{int num2 = (int)r.CallAs(typeIFileDialog, dialog, "Show", hWndOwner);flag = 0 == num2;}finally{r.CallAs(typeIFileDialog, dialog, "Unadvise", num);GC.KeepAlive(pfde);}}else{var fbd = new FolderBrowserDialog();fbd.Description = this.Title;fbd.SelectedPath = this.InitialDirectory;fbd.ShowNewFolderButton = false;if (fbd.ShowDialog(new WindowWrapper(hWndOwner)) != DialogResult.OK) return false;ofd.FileName = fbd.SelectedPath;flag = true;}return flag;}#endregion}/// <summary>/// Creates IWin32Window around an IntPtr/// </summary>public class WindowWrapper : System.Windows.Forms.IWin32Window{/// <summary>/// Constructor/// </summary>/// <param name="handle">Handle to wrap</param>public WindowWrapper(IntPtr handle){_hwnd = handle;}/// <summary>/// Original ptr/// </summary>public IntPtr Handle{get { return _hwnd; }}private IntPtr _hwnd;}/// <summary>/// This class is from the Front-End for Dosbox and is used to present a 'vista' dialog box to select folders./// Being able to use a vista style dialog box to select folders is much better then using the shell folder browser./// http://code.google.com/p/fed/////// Example:/// var r = new Reflector("System.Windows.Forms");/// </summary>public class Reflector{#region variablesstring m_ns;Assembly m_asmb;#endregion#region Constructors/// <summary>/// Constructor/// </summary>/// <param name="ns">The namespace containing types to be used</param>public Reflector(string ns): this(ns, ns){ }/// <summary>/// Constructor/// </summary>/// <param name="an">A specific assembly name (used if the assembly name does not tie exactly with the namespace)</param>/// <param name="ns">The namespace containing types to be used</param>public Reflector(string an, string ns){m_ns = ns;m_asmb = null;foreach (AssemblyName aN in Assembly.GetExecutingAssembly().GetReferencedAssemblies()){if (aN.FullName.StartsWith(an)){m_asmb = Assembly.Load(aN);break;}}}#endregion#region Methods/// <summary>/// Return a Type instance for a type 'typeName'/// </summary>/// <param name="typeName">The name of the type</param>/// <returns>A type instance</returns>public Type GetType(string typeName){Type type = null;string[] names = typeName.Split('.');if (names.Length > 0)type = m_asmb.GetType(m_ns + "." + names[0]);for (int i = 1; i < names.Length; ++i){type = type.GetNestedType(names[i], BindingFlags.NonPublic);}return type;}/// <summary>/// Create a new object of a named type passing along any params/// </summary>/// <param name="name">The name of the type to create</param>/// <param name="parameters"></param>/// <returns>An instantiated type</returns>public object New(string name, params object[] parameters){Type type = GetType(name);ConstructorInfo[] ctorInfos = type.GetConstructors();foreach (ConstructorInfo ci in ctorInfos){try{return ci.Invoke(parameters);}catch { }}return null;}/// <summary>/// Calls method 'func' on object 'obj' passing parameters 'parameters'/// </summary>/// <param name="obj">The object on which to excute function 'func'</param>/// <param name="func">The function to execute</param>/// <param name="parameters">The parameters to pass to function 'func'</param>/// <returns>The result of the function invocation</returns>public object Call(object obj, string func, params object[] parameters){return Call2(obj, func, parameters);}/// <summary>/// Calls method 'func' on object 'obj' passing parameters 'parameters'/// </summary>/// <param name="obj">The object on which to excute function 'func'</param>/// <param name="func">The function to execute</param>/// <param name="parameters">The parameters to pass to function 'func'</param>/// <returns>The result of the function invocation</returns>public object Call2(object obj, string func, object[] parameters){return CallAs2(obj.GetType(), obj, func, parameters);}/// <summary>/// Calls method 'func' on object 'obj' which is of type 'type' passing parameters 'parameters'/// </summary>/// <param name="type">The type of 'obj'</param>/// <param name="obj">The object on which to excute function 'func'</param>/// <param name="func">The function to execute</param>/// <param name="parameters">The parameters to pass to function 'func'</param>/// <returns>The result of the function invocation</returns>public object CallAs(Type type, object obj, string func, params object[] parameters){return CallAs2(type, obj, func, parameters);}/// <summary>/// Calls method 'func' on object 'obj' which is of type 'type' passing parameters 'parameters'/// </summary>/// <param name="type">The type of 'obj'</param>/// <param name="obj">The object on which to excute function 'func'</param>/// <param name="func">The function to execute</param>/// <param name="parameters">The parameters to pass to function 'func'</param>/// <returns>The result of the function invocation</returns>public object CallAs2(Type type, object obj, string func, object[] parameters){MethodInfo methInfo = type.GetMethod(func, BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);return methInfo.Invoke(obj, parameters);}/// <summary>/// Returns the value of property 'prop' of object 'obj'/// </summary>/// <param name="obj">The object containing 'prop'</param>/// <param name="prop">The property name</param>/// <returns>The property value</returns>public object Get(object obj, string prop){return GetAs(obj.GetType(), obj, prop);}/// <summary>/// Returns the value of property 'prop' of object 'obj' which has type 'type'/// </summary>/// <param name="type">The type of 'obj'</param>/// <param name="obj">The object containing 'prop'</param>/// <param name="prop">The property name</param>/// <returns>The property value</returns>public object GetAs(Type type, object obj, string prop){PropertyInfo propInfo = type.GetProperty(prop, BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);return propInfo.GetValue(obj, null);}/// <summary>/// Returns an enum value/// </summary>/// <param name="typeName">The name of enum type</param>/// <param name="name">The name of the value</param>/// <returns>The enum value</returns>public object GetEnum(string typeName, string name){Type type = GetType(typeName);FieldInfo fieldInfo = type.GetField(name);return fieldInfo.GetValue(null);}#endregion}

2、调用

FolderSelectDialog dialog = new FolderSelectDialog();dialog.InitialDirectory = "c://";if (dialog.ShowDialog()){var dialogFileName = dialog.FileName;}