/// <summary>
/// 合并过滤器，获取最终的过滤器，例如：
/// 表格文件(*.xls;*.xlsx)|*.xls;*.xlsx|所有文件(*.*)|*.*
/// </summary>
/// <param name="extFilters"></param>
/// <returns></returns>
private static FileExtFilter Combine(this List <FileExtFilter> extFilters)
{
if (extFilters.IsEmpty())
{
return(null);
}
var result = new FileExtFilter();
var sbFilter = new StringBuilder();
foreach (var extFilter in extFilters)
{
if (null == extFilter)
{
continue;
}
if (!result.DefaultExt.IsValid())
{
result.DefaultExt = extFilter.DefaultExt;
}
if (sbFilter.Length > 0)
{
sbFilter.Append("|");
}
sbFilter.Append(extFilter.Filter);
}
result.Filter = sbFilter.ToString();
return(result);
}
/// <summary>
/// 选择保存路径
/// </summary>
/// <param name="extFilter"></param>
/// <param name="fileName">要保存的文件名称</param>
/// <param name="title">窗口标题</param>
/// <param name="initialDirectory">初始化目录路径</param>
/// <returns></returns>
private static string SelectSavePath(this FileExtFilter extFilter, string fileName, string title = "选择文件", string initialDirectory = null)
{
var sfd = new SaveFileDialog
{
Filter = extFilter?.Filter,
Title = title,
FileName = fileName,
InitialDirectory = initialDirectory.GetValue(Environment.GetFolderPath(Environment.SpecialFolder.Desktop)),
RestoreDirectory = true,
AddExtension = true,
//CheckFileExists = true,
//CheckPathExists = true,
};
if (sfd.ShowDialog() != DialogResult.OK)
{
return(string.Empty);
}
if (!Path.HasExtension(sfd.FileName) &&
extFilter != null && extFilter.DefaultExt.IsValid())
{
return($"{sfd.FileName}.{extFilter.DefaultExt.LowerCase()}");
}
return(sfd.FileName);
}
/// <summary>
/// 批量选择文件
/// </summary>
/// <param name="extFilter"></param>
/// <param name="multiSelect">是否多选</param>
/// <param name="title">窗口标题</param>
/// <param name="initialDirectory">初始化目录路径</param>
/// <returns></returns>
private static List <string> SelectFiles(this FileExtFilter extFilter, bool multiSelect, string title = "选择文件", string initialDirectory = null)
{
if (null == extFilter || !extFilter.Filter.IsValid())
{
return(null);
}
var ofd = new OpenFileDialog
{
Filter = extFilter.Filter,
Title = title,
InitialDirectory = initialDirectory.GetValue(Environment.GetFolderPath(Environment.SpecialFolder.Desktop)),
RestoreDirectory = true,
AddExtension = true,
Multiselect = multiSelect,
CheckFileExists = true,
CheckPathExists = true,
};
if (ofd.ShowDialog() != DialogResult.OK)
{
return(null);
}
var fileNames = new List <string>();
if (ofd.FileNames.IsEmpty())
{
fileNames.Add(ofd.FileName);
}
else
{
fileNames.AddRange(ofd.FileNames);
}
return(fileNames);
}
/// <summary> /// 选择文件 /// </summary> /// <param name="extFilter"></param> /// <param name="title">窗口标题</param> /// <param name="initialDirectory">初始化目录路径</param> /// <returns></returns> private static string SelectFile(this FileExtFilter extFilter, string title = "选择文件", string initialDirectory = null) => extFilter.SelectFiles(false, title, initialDirectory)?.FirstOrDefault();
