C# 共享内存

共享内存定义

共享内存（Shared Memory）是一种进程间通信（IPC）机制，通过它，多个进程可以访问同一块内存，从而实现高效的数据共享和通信。这种方式比其他IPC机制（如管道、消息队列）更高效，因为它避免了数据在进程间的复制。

帮助类编写

public class SharedMemoryHelper
{private string memoryName;private string mutexName;private Mutex mutex;public SharedMemoryHelper(string memoryName, string mutexName){this.memoryName = memoryName;this.mutexName = mutexName;this.mutex = new Mutex(false, mutexName);}public bool IsSharedMemoryCreated(){try{MemoryMappedFile.OpenExisting(memoryName);return true;}catch (FileNotFoundException){return false;}}public void WriteToSharedMemory(string message){mutex.WaitOne();try{MemoryMappedFile mmf = MemoryMappedFile.CreateOrOpen(memoryName, 1024);MemoryMappedViewAccessor accessor = mmf.CreateViewAccessor();byte[] clearBuffer = new byte[1024];accessor.WriteArray(0, clearBuffer, 0, clearBuffer.Length);byte[] buffer = Encoding.UTF8.GetBytes(message);accessor.WriteArray(0, buffer, 0, buffer.Length);}finally{mutex.ReleaseMutex();}}public string ReadFromSharedMemory(){mutex.WaitOne();try{MemoryMappedFile mmf = MemoryMappedFile.OpenExisting(memoryName);MemoryMappedViewAccessor accessor = mmf.CreateViewAccessor();byte[] buffer = new byte[1024];accessor.ReadArray(0, buffer, 0, buffer.Length);return Encoding.UTF8.GetString(buffer).TrimEnd('\0');}catch (FileNotFoundException){throw new InvalidOperationException("找不到共享内存文件.");}finally{mutex.ReleaseMutex();}}
}

使用方法

private readonly SharedMemoryHelper _SharedMemory;
public MainWindowViewModel()
{_SharedMemory = new SharedMemoryHelper(MemoryName, MutexName);_SharedMemory.WriteToSharedMemory(WriteMessage);if (_SharedMemory.IsSharedMemoryCreated()){Test = JsonConvert.DeserializeObject<Test>(ReadMessage);}else{MessageBox.Show("读取不到内存文件!");}
}