C# 擷取選擇檔案資訊

C# 擷取選擇檔案資訊

private bool GetDocuContent(out byte[] Content, out string FileName, out string ExtensionName)        {            long MaxLength = 10485760; //10M以內            Content = null;            ExtensionName = string.Empty;            FileName = string.Empty;            OpenFileDialog vsOpenFileDialog = new OpenFileDialog();            vsOpenFileDialog.InitialDirectory = "d:\\";            vsOpenFileDialog.Filter = "All files (*.*)|*.*";            vsOpenFileDialog.FilterIndex = 0;            vsOpenFileDialog.Multiselect = false;            try            {                if (vsOpenFileDialog.ShowDialog() == DialogResult.OK)                {                    //Path.GetExtension方法:返回指定的路徑字串的副檔名                    ExtensionName = Path.GetExtension(vsOpenFileDialog.FileName);                    //Path.GetFileName方法:返回指定路徑字串的檔案名稱和副檔名。                    FileName = Path.GetFileName(vsOpenFileDialog.FileName);                    FileInfo vsFileInfo = new FileInfo(vsOpenFileDialog.FileName);                    if (vsFileInfo.Length > MaxLength)                    {                        MessageBox.Show("檔案超長！");                        return false;                    }                    //vsFileInfo.OpenRead Method:Creates a read-only FileStream.                    FileStream fileStream = vsFileInfo.OpenRead();                    if (fileStream.Length == 0)                    {                        MessageBox.Show("空檔案！");                        return false;                    }                    Content = new byte[fileStream.Length];                    int Size = fileStream.Read(Content, 0, Convert.ToInt32(fileStream.Length));                    fileStream.Close();                    return true;                }                return false;            }            catch (Exception ex)            {                return false;            }        }

小註：

1、 C# Winform OpenFileDialog 控制項

2、C# FileStream.Read Method

假如選擇的檔案1111.png，是跟蹤內容顯示：

ExtensionName = Path.GetExtension(vsOpenFileDialog.FileName)

FileName = Path.GetFileName(vsOpenFileDialog.FileName)

FileInfo vsFileInfo = new FileInfo(vsOpenFileDialog.FileName)

Content = new byte[fileStream.Length]

4、假如相對返回的byte[] Content加密的話，可以使用：Convert.ToBase64String(Content)，該函數的傳回值，依然是：byte[]類型的。

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