public FileOperationResult ObservedSave(NamedFileOperationDelegate saveFileAs, string fileName, string message, FileErrorPolicy policy)
{
Debug.Assert(IsValidFileName(fileName));
try
{
saveFileAs(fileName);
return(FileOperationResult.OK);
}
catch (Exception e)
{
switch (policy)
{
case FileErrorPolicy.Inform:
using (SaveErrorInformDialog informDialog = new SaveErrorInformDialog(fileName, message, "Error while saving", e))
{
informDialog.ShowDialog();
}
break;
case FileErrorPolicy.ProvideAlternative:
restartlabel:
using (SaveErrorChooseDialog chooseDialog = new SaveErrorChooseDialog(fileName, message, "Error while saving", e, true))
{
switch (chooseDialog.ShowDialog())
{
case DialogResult.OK:
using (SaveFileDialog fdiag = new SaveFileDialog())
{
fdiag.OverwritePrompt = true;
fdiag.AddExtension = true;
fdiag.CheckFileExists = false;
fdiag.CheckPathExists = true;
fdiag.Title = "Choose alternate file name";
fdiag.FileName = fileName;
if (fdiag.ShowDialog() == DialogResult.OK)
{
return(ObservedSave(saveFileAs, fdiag.FileName, message, policy));
}
else
{
goto restartlabel;
}
}
case DialogResult.Retry:
return(ObservedSave(saveFileAs, fileName, message, policy));
case DialogResult.Ignore:
return(FileOperationResult.Failed);
}
}
break;
}
}
return(FileOperationResult.Failed);
}
public FileOperationResult ObservedLoad(FileOperationDelegate loadFileDelegate, string fileName, string message, FileErrorPolicy policy)
{
Debug.Assert(IsValidFileName(fileName));
//Eventually do the load file action.
try
{
loadFileDelegate(); //通过这个委托来真正最后调用实际的方法,所有的ObservedLoad方法
//无论是NamedFileOperation还是FileOperation最终都会通过这个委托来调用所对应的方�?
return(FileOperationResult.OK);
}
catch (Exception e)
{
switch (policy)
{
case FileErrorPolicy.Inform:
using (SaveErrorInformDialog informDialog = new SaveErrorInformDialog(fileName, message, "Error while loading", e))
{
informDialog.ShowDialog();
}
break;
case FileErrorPolicy.ProvideAlternative:
using (SaveErrorChooseDialog chooseDialog = new SaveErrorChooseDialog(fileName, message, "Error while loading", e, false))
{
switch (chooseDialog.ShowDialog())
{
case DialogResult.OK: // choose location (never happens here)
break;
case DialogResult.Retry:
return(ObservedLoad(loadFileDelegate, fileName, message, policy));
case DialogResult.Ignore:
return(FileOperationResult.Failed);
}
}
break;
}
}
return(FileOperationResult.Failed);
}
//定义一些受保护的加载文件和保存文件的方�?具体执行的函数是通过委托实例来执行的.
#region ObservedSaveOrLoad Methods
public FileOperationResult ObservedSave(FileOperationDelegate saveFile, string fileName, string message, FileErrorPolicy policy)
{
Debug.Assert(IsValidFileName(fileName));
try
{
saveFile();
return(FileOperationResult.OK);
}
catch (Exception e)
{
switch (policy)
{
case FileErrorPolicy.Inform:
using (SaveErrorInformDialog informDialog = new SaveErrorInformDialog(fileName, message, "Error while saving", e))
{
informDialog.ShowDialog();
}
break;
case FileErrorPolicy.ProvideAlternative:
using (SaveErrorChooseDialog chooseDialog = new SaveErrorChooseDialog(fileName, message, "Error while saving", e, false))
{
switch (chooseDialog.ShowDialog())
{
case DialogResult.OK: // choose location (never happens here)
break;
case DialogResult.Retry:
return(ObservedSave(saveFile, fileName, message, policy));
case DialogResult.Ignore:
return(FileOperationResult.Failed);
}
}
break;
}
}
return(FileOperationResult.Failed);
}
public FileOperationResult ObservedLoad(FileOperationDelegate loadFileDelegate, string fileName, string message, FileErrorPolicy policy)
{
Debug.Assert(IsValidFileName(fileName));
//Eventually do the load file action.
try
{
loadFileDelegate();//通过这个委托来真正最后调用实际的方法,所有的ObservedLoad方法
//无论是NamedFileOperation还是FileOperation最终都会通过这个委托来调用所对应的方�?
return FileOperationResult.OK;
}
catch (Exception e)
{
switch (policy)
{
case FileErrorPolicy.Inform:
using (SaveErrorInformDialog informDialog = new SaveErrorInformDialog(fileName, message, "Error while loading", e))
{
informDialog.ShowDialog();
}
break;
case FileErrorPolicy.ProvideAlternative:
using (SaveErrorChooseDialog chooseDialog = new SaveErrorChooseDialog(fileName, message, "Error while loading", e, false))
{
switch (chooseDialog.ShowDialog())
{
case DialogResult.OK: // choose location (never happens here)
break;
case DialogResult.Retry:
return ObservedLoad(loadFileDelegate, fileName, message, policy);
case DialogResult.Ignore:
return FileOperationResult.Failed;
}
}
break;
}
}
return FileOperationResult.Failed;
}
public FileOperationResult ObservedSave(NamedFileOperationDelegate saveFileAs, string fileName, string message, FileErrorPolicy policy)
{
Debug.Assert(IsValidFileName(fileName));
try
{
saveFileAs(fileName);
return FileOperationResult.OK;
}
catch (Exception e)
{
switch (policy)
{
case FileErrorPolicy.Inform:
using (SaveErrorInformDialog informDialog = new SaveErrorInformDialog(fileName, message, "Error while saving", e))
{
informDialog.ShowDialog();
}
break;
case FileErrorPolicy.ProvideAlternative:
restartlabel:
using (SaveErrorChooseDialog chooseDialog = new SaveErrorChooseDialog(fileName, message, "Error while saving", e, true))
{
switch (chooseDialog.ShowDialog())
{
case DialogResult.OK:
using (SaveFileDialog fdiag = new SaveFileDialog())
{
fdiag.OverwritePrompt = true;
fdiag.AddExtension = true;
fdiag.CheckFileExists = false;
fdiag.CheckPathExists = true;
fdiag.Title = "Choose alternate file name";
fdiag.FileName = fileName;
if (fdiag.ShowDialog() == DialogResult.OK)
{
return ObservedSave(saveFileAs, fdiag.FileName, message, policy);
}
else
{
goto restartlabel;
}
}
case DialogResult.Retry:
return ObservedSave(saveFileAs, fileName, message, policy);
case DialogResult.Ignore:
return FileOperationResult.Failed;
}
}
break;
}
}
return FileOperationResult.Failed;
}
//定义一些受保护的加载文件和保存文件的方�?具体执行的函数是通过委托实例来执行的.
#region ObservedSaveOrLoad Methods
public FileOperationResult ObservedSave(FileOperationDelegate saveFile, string fileName, string message, FileErrorPolicy policy)
{
Debug.Assert(IsValidFileName(fileName));
try
{
saveFile();
return FileOperationResult.OK;
}
catch (Exception e)
{
switch (policy)
{
case FileErrorPolicy.Inform:
using (SaveErrorInformDialog informDialog = new SaveErrorInformDialog(fileName, message, "Error while saving", e))
{
informDialog.ShowDialog();
}
break;
case FileErrorPolicy.ProvideAlternative:
using (SaveErrorChooseDialog chooseDialog = new SaveErrorChooseDialog(fileName, message, "Error while saving", e, false))
{
switch (chooseDialog.ShowDialog())
{
case DialogResult.OK: // choose location (never happens here)
break;
case DialogResult.Retry:
return ObservedSave(saveFile, fileName, message, policy);
case DialogResult.Ignore:
return FileOperationResult.Failed;
}
}
break;
}
}
return FileOperationResult.Failed;
}