题
我如何可以本控制用户,允许他/她选择的目录?
似乎没有任何土生土长的。净控制其这样做?
解决方案
的 FolderBrowserDialog类 是最好的选择。
其他提示
string folderPath = "";
FolderBrowserDialog folderBrowserDialog1 = new FolderBrowserDialog();
if (folderBrowserDialog1.ShowDialog() == DialogResult.OK) {
folderPath = folderBrowserDialog1.SelectedPath ;
}
注:没有保证这个代码将在未来版本的.净框架。使用私人的。净框架内为这里所做的通过反映的可能是不好的整体。使用互操作方案提到的底部,因为Windows API是不太可能改变。
如果你是在寻找一个文件夹选择器,看起来更像Windows7对话,能够复制和粘贴文本框的底部和导航格上剩下的最爱和共同的地点,然后你可以得到访问,在非常轻的方式。
该FolderBrowserDialog UI是很小的:
但是你可以拥有这个:
这里有一个类打开了一个Vista式文件夹选择器使用。净私人 IFileDialog
接口,没有直接使用互操作程序的代码(.净需要照顾的为您)。它回落到预Vista对话,如果未在足够高的窗版本。应该在Windows7、8、9、10和更高(从理论上).
using System;
using System.Reflection;
using System.Windows.Forms;
namespace MyCoolCompany.Shuriken {
/// <summary>
/// Present the Windows Vista-style open file dialog to select a folder. Fall back for older Windows Versions
/// </summary>
public class FolderSelectDialog {
private string _initialDirectory;
private string _title;
private string _fileName = "";
public string InitialDirectory {
get { return string.IsNullOrEmpty(_initialDirectory) ? Environment.CurrentDirectory : _initialDirectory; }
set { _initialDirectory = value; }
}
public string Title {
get { return _title ?? "Select a folder"; }
set { _title = value; }
}
public string FileName { get { return _fileName; } }
public bool Show() { return Show(IntPtr.Zero); }
/// <param name="hWndOwner">Handle of the control or window to be the parent of the file dialog</param>
/// <returns>true if the user clicks OK</returns>
public bool Show(IntPtr hWndOwner) {
var result = Environment.OSVersion.Version.Major >= 6
? VistaDialog.Show(hWndOwner, InitialDirectory, Title)
: ShowXpDialog(hWndOwner, InitialDirectory, Title);
_fileName = result.FileName;
return result.Result;
}
private struct ShowDialogResult {
public bool Result { get; set; }
public string FileName { get; set; }
}
private static ShowDialogResult ShowXpDialog(IntPtr ownerHandle, string initialDirectory, string title) {
var folderBrowserDialog = new FolderBrowserDialog {
Description = title,
SelectedPath = initialDirectory,
ShowNewFolderButton = false
};
var dialogResult = new ShowDialogResult();
if (folderBrowserDialog.ShowDialog(new WindowWrapper(ownerHandle)) == DialogResult.OK) {
dialogResult.Result = true;
dialogResult.FileName = folderBrowserDialog.SelectedPath;
}
return dialogResult;
}
private static class VistaDialog {
private const string c_foldersFilter = "Folders|\n";
private const BindingFlags c_flags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
private readonly static Assembly s_windowsFormsAssembly = typeof(FileDialog).Assembly;
private readonly static Type s_iFileDialogType = s_windowsFormsAssembly.GetType("System.Windows.Forms.FileDialogNative+IFileDialog");
private readonly static MethodInfo s_createVistaDialogMethodInfo = typeof(OpenFileDialog).GetMethod("CreateVistaDialog", c_flags);
private readonly static MethodInfo s_onBeforeVistaDialogMethodInfo = typeof(OpenFileDialog).GetMethod("OnBeforeVistaDialog", c_flags);
private readonly static MethodInfo s_getOptionsMethodInfo = typeof(FileDialog).GetMethod("GetOptions", c_flags);
private readonly static MethodInfo s_setOptionsMethodInfo = s_iFileDialogType.GetMethod("SetOptions", c_flags);
private readonly static uint s_fosPickFoldersBitFlag = (uint) s_windowsFormsAssembly
.GetType("System.Windows.Forms.FileDialogNative+FOS")
.GetField("FOS_PICKFOLDERS")
.GetValue(null);
private readonly static ConstructorInfo s_vistaDialogEventsConstructorInfo = s_windowsFormsAssembly
.GetType("System.Windows.Forms.FileDialog+VistaDialogEvents")
.GetConstructor(c_flags, null, new[] { typeof(FileDialog) }, null);
private readonly static MethodInfo s_adviseMethodInfo = s_iFileDialogType.GetMethod("Advise");
private readonly static MethodInfo s_unAdviseMethodInfo = s_iFileDialogType.GetMethod("Unadvise");
private readonly static MethodInfo s_showMethodInfo = s_iFileDialogType.GetMethod("Show");
public static ShowDialogResult Show(IntPtr ownerHandle, string initialDirectory, string title) {
var openFileDialog = new OpenFileDialog {
AddExtension = false,
CheckFileExists = false,
DereferenceLinks = true,
Filter = c_foldersFilter,
InitialDirectory = initialDirectory,
Multiselect = false,
Title = title
};
var iFileDialog = s_createVistaDialogMethodInfo.Invoke(openFileDialog, new object[] { });
s_onBeforeVistaDialogMethodInfo.Invoke(openFileDialog, new[] { iFileDialog });
s_setOptionsMethodInfo.Invoke(iFileDialog, new object[] { (uint) s_getOptionsMethodInfo.Invoke(openFileDialog, new object[] { }) | s_fosPickFoldersBitFlag });
var adviseParametersWithOutputConnectionToken = new[] { s_vistaDialogEventsConstructorInfo.Invoke(new object[] { openFileDialog }), 0U };
s_adviseMethodInfo.Invoke(iFileDialog, adviseParametersWithOutputConnectionToken);
try {
int retVal = (int) s_showMethodInfo.Invoke(iFileDialog, new object[] { ownerHandle });
return new ShowDialogResult {
Result = retVal == 0,
FileName = openFileDialog.FileName
};
}
finally {
s_unAdviseMethodInfo.Invoke(iFileDialog, new[] { adviseParametersWithOutputConnectionToken[1] });
}
}
}
// Wrap an IWin32Window around an IntPtr
private class WindowWrapper : IWin32Window {
private readonly IntPtr _handle;
public WindowWrapper(IntPtr handle) { _handle = handle; }
public IntPtr Handle { get { return _handle; } }
}
}
}
我发明了这个作为清理的版本 .净赢得7式文件夹选择对话 由比尔登的 lyquidity.com (我没有从属关系).我写了我自己,因为他的解决方案需要的额外反射类,不需要对这一重点的目的,使用基于异常的流动的控制,不缓的结果,其反思的电话。注意嵌套静 VistaDialog
类是这样,其静态反射的变量不要尝试去填充如果 Show
方法是从来没有所谓。
它是用于像这样在一个窗户的形式:
var dialog = new FolderSelectDialog {
InitialDirectory = musicFolderTextBox.Text,
Title = "Select a folder to import music from"
};
if (dialog.Show(Handle)) {
musicFolderTextBox.Text = dialog.FileName;
}
你当然可以玩弄其选择以及什么样的属性,它暴露了.例如,它可以允许多选在Vista式对话。
此外,请注意 西蒙风穆里耶给了答案 这显示了,如何做到确切的同样的工作,使用互操作对Windows API直接的,虽然他的版本将具有予以补充,使用老式的对话,如果在一个旧版本的Windows。不幸的是,我没有找到他的岗位然而,当我工作了我的解决方案。名字你的毒药!
你可以使用 FolderBrowserDialog
类的 System.Windows.Forms
名字空间。
请不要尝试和推出自己的一个树视图/路径类。对于一件事情还有很多不错的功能你得到免费的(图标/右击网络)通过使用SHBrowseForFolder.另有一种边缘情况/抓住你可能不会知道的。
你可以使用一个树视图结合的路径类。
为了更多的功能比FolderBrowserdialog,像筛选、检查箱,等等,看一看第3次缔约方的控制 壳MegaPack.因为它们是控制,使他们可以放在自己的形式,而不是作为一个模式对话。
或甚至更多更好的,你可以把这些代码类文件
using System;
using System.IO;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Windows.Forms;
internal class OpenFolderDialog : IDisposable {
/// <summary>
/// Gets/sets folder in which dialog will be open.
/// </summary>
public string InitialFolder { get; set; }
/// <summary>
/// Gets/sets directory in which dialog will be open if there is no recent directory available.
/// </summary>
public string DefaultFolder { get; set; }
/// <summary>
/// Gets selected folder.
/// </summary>
public string Folder { get; private set; }
internal DialogResult ShowDialog(IWin32Window owner) {
if (Environment.OSVersion.Version.Major >= 6) {
return ShowVistaDialog(owner);
} else {
return ShowLegacyDialog(owner);
}
}
private DialogResult ShowVistaDialog(IWin32Window owner) {
var frm = (NativeMethods.IFileDialog)(new NativeMethods.FileOpenDialogRCW());
uint options;
frm.GetOptions(out options);
options |= NativeMethods.FOS_PICKFOLDERS | NativeMethods.FOS_FORCEFILESYSTEM | NativeMethods.FOS_NOVALIDATE | NativeMethods.FOS_NOTESTFILECREATE | NativeMethods.FOS_DONTADDTORECENT;
frm.SetOptions(options);
if (this.InitialFolder != null) {
NativeMethods.IShellItem directoryShellItem;
var riid = new Guid("43826D1E-E718-42EE-BC55-A1E261C37BFE"); //IShellItem
if (NativeMethods.SHCreateItemFromParsingName(this.InitialFolder, IntPtr.Zero, ref riid, out directoryShellItem) == NativeMethods.S_OK) {
frm.SetFolder(directoryShellItem);
}
}
if (this.DefaultFolder != null) {
NativeMethods.IShellItem directoryShellItem;
var riid = new Guid("43826D1E-E718-42EE-BC55-A1E261C37BFE"); //IShellItem
if (NativeMethods.SHCreateItemFromParsingName(this.DefaultFolder, IntPtr.Zero, ref riid, out directoryShellItem) == NativeMethods.S_OK) {
frm.SetDefaultFolder(directoryShellItem);
}
}
if (frm.Show(owner.Handle) == NativeMethods.S_OK) {
NativeMethods.IShellItem shellItem;
if (frm.GetResult(out shellItem) == NativeMethods.S_OK) {
IntPtr pszString;
if (shellItem.GetDisplayName(NativeMethods.SIGDN_FILESYSPATH, out pszString) == NativeMethods.S_OK) {
if (pszString != IntPtr.Zero) {
try {
this.Folder = Marshal.PtrToStringAuto(pszString);
return DialogResult.OK;
} finally {
Marshal.FreeCoTaskMem(pszString);
}
}
}
}
}
return DialogResult.Cancel;
}
private DialogResult ShowLegacyDialog(IWin32Window owner) {
using (var frm = new SaveFileDialog()) {
frm.CheckFileExists = false;
frm.CheckPathExists = true;
frm.CreatePrompt = false;
frm.Filter = "|" + Guid.Empty.ToString();
frm.FileName = "any";
if (this.InitialFolder != null) { frm.InitialDirectory = this.InitialFolder; }
frm.OverwritePrompt = false;
frm.Title = "Select Folder";
frm.ValidateNames = false;
if (frm.ShowDialog(owner) == DialogResult.OK) {
this.Folder = Path.GetDirectoryName(frm.FileName);
return DialogResult.OK;
} else {
return DialogResult.Cancel;
}
}
}
public void Dispose() { } //just to have possibility of Using statement.
}
internal static class NativeMethods {
#region Constants
public const uint FOS_PICKFOLDERS = 0x00000020;
public const uint FOS_FORCEFILESYSTEM = 0x00000040;
public const uint FOS_NOVALIDATE = 0x00000100;
public const uint FOS_NOTESTFILECREATE = 0x00010000;
public const uint FOS_DONTADDTORECENT = 0x02000000;
public const uint S_OK = 0x0000;
public const uint SIGDN_FILESYSPATH = 0x80058000;
#endregion
#region COM
[ComImport, ClassInterface(ClassInterfaceType.None), TypeLibType(TypeLibTypeFlags.FCanCreate), Guid("DC1C5A9C-E88A-4DDE-A5A1-60F82A20AEF7")]
internal class FileOpenDialogRCW { }
[ComImport(), Guid("42F85136-DB7E-439C-85F1-E4075D135FC8"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
internal interface IFileDialog {
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
[PreserveSig()]
uint Show([In, Optional] IntPtr hwndOwner); //IModalWindow
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint SetFileTypes([In] uint cFileTypes, [In, MarshalAs(UnmanagedType.LPArray)] IntPtr rgFilterSpec);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint SetFileTypeIndex([In] uint iFileType);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint GetFileTypeIndex(out uint piFileType);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint Advise([In, MarshalAs(UnmanagedType.Interface)] IntPtr pfde, out uint pdwCookie);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint Unadvise([In] uint dwCookie);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint SetOptions([In] uint fos);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint GetOptions(out uint fos);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
void SetDefaultFolder([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint SetFolder([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint GetFolder([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint GetCurrentSelection([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint SetFileName([In, MarshalAs(UnmanagedType.LPWStr)] string pszName);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint GetFileName([MarshalAs(UnmanagedType.LPWStr)] out string pszName);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint SetTitle([In, MarshalAs(UnmanagedType.LPWStr)] string pszTitle);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint SetOkButtonLabel([In, MarshalAs(UnmanagedType.LPWStr)] string pszText);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint SetFileNameLabel([In, MarshalAs(UnmanagedType.LPWStr)] string pszLabel);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint GetResult([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint AddPlace([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi, uint fdap);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint SetDefaultExtension([In, MarshalAs(UnmanagedType.LPWStr)] string pszDefaultExtension);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint Close([MarshalAs(UnmanagedType.Error)] uint hr);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint SetClientGuid([In] ref Guid guid);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint ClearClientData();
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint SetFilter([MarshalAs(UnmanagedType.Interface)] IntPtr pFilter);
}
[ComImport, Guid("43826D1E-E718-42EE-BC55-A1E261C37BFE"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
internal interface IShellItem {
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint BindToHandler([In] IntPtr pbc, [In] ref Guid rbhid, [In] ref Guid riid, [Out, MarshalAs(UnmanagedType.Interface)] out IntPtr ppvOut);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint GetParent([MarshalAs(UnmanagedType.Interface)] out IShellItem ppsi);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint GetDisplayName([In] uint sigdnName, out IntPtr ppszName);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint GetAttributes([In] uint sfgaoMask, out uint psfgaoAttribs);
[MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
uint Compare([In, MarshalAs(UnmanagedType.Interface)] IShellItem psi, [In] uint hint, out int piOrder);
}
#endregion
[DllImport("shell32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
internal static extern int SHCreateItemFromParsingName([MarshalAs(UnmanagedType.LPWStr)] string pszPath, IntPtr pbc, ref Guid riid, [MarshalAs(UnmanagedType.Interface)] out IShellItem ppv);
}
并使用这样
using (var frm = new OpenFolderDialog()) {
if (frm.ShowDialog(this)== DialogResult.OK) {
MessageBox.Show(this, frm.Folder);
}
}
一个更好的方式来做到这一点,并与多个文件夹选择
using System;
using System.Reflection;
using System.Windows.Forms;
class OpenFolderDialog
{
//public bool AddExtension { get; set; }
public bool AutoUpgradeEnabled { get; set; }
//public bool CheckFileExists { get; set; }
public bool CheckPathExists { get; set; }
//public bool DereferenceLinks { get; set; }
public string Title { get; set; }
//public string DefaultExt { get; set; }
public string InitialDirectory { get; set; }
//public bool ValidateNames { get; set; }
//public bool SupportMultiDottedExtensions { get; set; }
//public bool ShowHelp { get; set; }
public bool Multiselect { get; set; }
public bool RestoreDirectory { get; set; }
//public string Filter { get; set; }
public string SelectedPath { get; private set; }
public string[] SelectedPaths { get; private set; }
private FolderBrowserDialog FolderBrowser
{
get
{
return new FolderBrowserDialog()
{
ShowNewFolderButton = true,
Description = Title,
SelectedPath = InitialDirectory
};
}
}
private OpenFileDialog Dialog
{
get
{
return new OpenFileDialog()
{
Title = Title,
AddExtension = false,
AutoUpgradeEnabled = AutoUpgradeEnabled,
CheckFileExists = true,
CheckPathExists = CheckPathExists,
DefaultExt = string.Empty,
DereferenceLinks = false,
InitialDirectory = InitialDirectory,
ValidateNames = false,
SupportMultiDottedExtensions = false,
ShowHelp = false,
Multiselect = Multiselect,
RestoreDirectory = RestoreDirectory,
Filter = string.Empty,
FileName = SelectedPath
};
}
}
/// <param name="hWndOwner">Handle of the control or window to be the parent of the file dialog</param>
/// <returns>true if the user clicks OK</returns>
public DialogResult ShowDialog(IntPtr hWndOwner)
{
if (Environment.OSVersion.Version.Major >= 6)
{
OpenFileDialog dialog = Dialog;
DialogResult result = VistaDialog.Show(hWndOwner, dialog) != 0 ? DialogResult.Cancel : DialogResult.OK;
SelectedPath = dialog.FileName;
SelectedPaths = dialog.FileNames;
return result;
}
else
{
FolderBrowserDialog XPDialog = FolderBrowser;
DialogResult result = XPDialog.ShowDialog();
SelectedPath = XPDialog.SelectedPath;
return result;
}
}
private static class VistaDialog
{
private const BindingFlags c_flags = BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic;
private readonly static Assembly s_windowsFormsAssembly = typeof(FileDialog).Assembly;
private readonly static Type s_iFileDialogType = s_windowsFormsAssembly.GetType("System.Windows.Forms.FileDialogNative+IFileDialog");
private readonly static MethodInfo s_createVistaDialogMethodInfo = typeof(OpenFileDialog).GetMethod("CreateVistaDialog", c_flags);
private readonly static MethodInfo s_onBeforeVistaDialogMethodInfo = typeof(OpenFileDialog).GetMethod("OnBeforeVistaDialog", c_flags);
private readonly static MethodInfo s_getOptionsMethodInfo = typeof(FileDialog).GetMethod("GetOptions", c_flags);
private readonly static MethodInfo s_setOptionsMethodInfo = s_iFileDialogType.GetMethod("SetOptions", c_flags);
private readonly static uint s_fosPickFoldersBitFlag = (uint)s_windowsFormsAssembly
.GetType("System.Windows.Forms.FileDialogNative+FOS")
.GetField("FOS_PICKFOLDERS")
.GetValue(null);
private readonly static ConstructorInfo s_vistaDialogEventsConstructorInfo = s_windowsFormsAssembly
.GetType("System.Windows.Forms.FileDialog+VistaDialogEvents")
.GetConstructor(c_flags, null, new[] { typeof(FileDialog) }, null);
private readonly static MethodInfo s_adviseMethodInfo = s_iFileDialogType.GetMethod("Advise");
private readonly static MethodInfo s_unAdviseMethodInfo = s_iFileDialogType.GetMethod("Unadvise");
private readonly static MethodInfo s_showMethodInfo = s_iFileDialogType.GetMethod("Show");
public static int Show(IntPtr ownerHandle, OpenFileDialog dialog)
{
var iFileDialog = s_createVistaDialogMethodInfo.Invoke(dialog, new object[] { });
s_onBeforeVistaDialogMethodInfo.Invoke(dialog, new[] { iFileDialog });
s_setOptionsMethodInfo.Invoke(iFileDialog, new object[] { (uint)s_getOptionsMethodInfo.Invoke(dialog, new object[] { }) | s_fosPickFoldersBitFlag });
var adviseParametersWithOutputConnectionToken = new[] { s_vistaDialogEventsConstructorInfo.Invoke(new object[] { dialog }), 0U };
s_adviseMethodInfo.Invoke(iFileDialog, adviseParametersWithOutputConnectionToken);
try
{
return (int)s_showMethodInfo.Invoke(iFileDialog, new object[] { ownerHandle });
}
finally
{
s_unAdviseMethodInfo.Invoke(iFileDialog, new[] { adviseParametersWithOutputConnectionToken[1] });
}
}
}
}
使用:
OpenFolderDialog folder = new OpenFolderDialog()
{
Title = "Select destination folder",
AutoUpgradeEnabled = true,
CheckPathExists = true,
InitialDirectory =
Environment.GetFolderPath
(Environment.SpecialFolder.DesktopDirectory),
Multiselect = true,
RestoreDirectory = true
};
DialogResult result = folder.ShowDialog(IntPtr.Zero);
if (result.Equals(DialogResult.OK))
MessageBox.Show(folder.SelectedPath + " Paths:" + folder.SelectedPaths.Length);