Question

我有一个在.NET Compact Framework 3.5上运行的移动应用程序和一个在同一平台上运行的更新程序。当用户点击应用程序快捷方式时，更新程序应用程序首先运行并检查是否有新版本的主应用程序。是可用的。为此，我使用Assembly.LoadFrom方法加载主exe程序集并获取当前版本。如果找到新版本（通过Web服务），则会下载新文件并替换。这很好用。问题是，当它尝试替换主exe文件时，它会因为“另一个进程使用”样式异常而失败（可能是因为它之前已经加载过）。如何卸载此程序集或如何在不加载它的情况下获取其版本？

我已经对Assembly类和AppDomain做了一些研究，但.NET CF有一些局限性，所以我无法弄明白。

有什么想法吗？

感谢。

Answer 1

使用AssemblyName.GetAssemblyName(string)或FileVersionInfo的“传统”方式不起作用，因为.NET CF不支持它们。要在不使用Assembly.LoadFrom的情况下执行此操作，您需要使用P / Invoke本机获取文件版本信息。您可以尝试使用此代码（ 未经测试 ）：

[DllImport("coredll", EntryPoint = "GetFileVersionInfo", SetLastError = true)]
private static extern bool GetFileVersionInfo(string filename, int handle, int len, IntPtr buffer);
[DllImport("coredll", EntryPoint = "GetFileVersionInfoSize", SetLastError = true)]
private static extern int GetFileVersionInfoSize(string filename, ref int handle);
[DllImport("coredll", EntryPoint = "VerQueryValue", SetLastError = true)]
private static extern bool VerQueryValue(IntPtr buffer, string subblock, ref IntPtr blockbuffer, ref int len);

public static Version GetFileVersionCe(string fileName)
{
    int handle = 0;
    int length = GetFileVersionInfoSize(fileName, ref handle);
    Version v = null;
    if (length > 0)
    {
        IntPtr buffer = System.Runtime.InteropServices.Marshal.AllocHGlobal(length);
        if (GetFileVersionInfo(fileName, handle, length, buffer))
        {
            IntPtr fixedbuffer = IntPtr.Zero;
            int fixedlen = 0;
            if (VerQueryValue(buffer, "\\", ref fixedbuffer, ref fixedlen))
            {
                byte[] fixedversioninfo = new byte[fixedlen];
                System.Runtime.InteropServices.Marshal.Copy(fixedbuffer, fixedversioninfo, 0, fixedlen);
                v = new Version(
                    BitConverter.ToInt16(fixedversioninfo, 10), 
                    BitConverter.ToInt16(fixedversioninfo,  8), 
                    BitConverter.ToInt16(fixedversioninfo, 14),
                    BitConverter.ToInt16(fixedversioninfo, 12));
            }
        }
        Marshal.FreeHGlobal(buffer);
    }
    return v;
}

Answer 2

旧帖子，但万一有人在寻找它。我的VB（工作）版本。

Public Declare Function GetFileVersionInfo Lib "Coredll" (ByVal filename As String, ByVal handle As Integer, ByVal len As Integer, ByVal buffer As IntPtr) As Boolean
        Public Declare Function GetFileVersionInfoSize Lib "Coredll" (ByVal filename As String, ByRef handle As Integer) As Integer
        Public Declare Function VerQueryValue Lib "Coredll" (ByVal buffer As IntPtr, ByVal subblock As String, ByRef blockbuffer As IntPtr, ByRef len As Integer) As Boolean

Public Function GetFileVersionCE(ByVal fileName As String) As Version
            Dim handle = 0
            Dim length = GetFileVersionInfoSize(fileName, handle)
            Dim v As Version = Nothing

            If length > 0 Then
                Dim buffer As IntPtr = Marshal.AllocHGlobal(length)
                If (GetFileVersionInfo(fileName, handle, length, buffer)) Then
                    Dim fixedbuffer As IntPtr = IntPtr.Zero
                    Dim fixedlen As Integer = 0

                    If (VerQueryValue(buffer, "\\", fixedbuffer, fixedlen)) Then

                        Dim fixedversioninfo(fixedlen) As Byte
                        Marshal.Copy(fixedbuffer, fixedversioninfo, 0, fixedlen)
                        v = New Version(BitConverter.ToInt16(fixedversioninfo, 10), _
                                        BitConverter.ToInt16(fixedversioninfo, 8), _
                                        BitConverter.ToInt16(fixedversioninfo, 14), _
                                        BitConverter.ToInt16(fixedversioninfo, 12))
                    End If
                End If
                Marshal.FreeHGlobal(buffer)
            End If

            Return v

        End Function

获取exe文件的版本而不在.NET Compact Framework中加载

2 个答案: