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C# File.Open的代码示例

通过代码示例来学习C# File.Open方法

通过代码示例来学习编程是非常高效的。
1. 代码示例提供了一个具体而直观的学习环境，使初学者能够立即看到编程概念和语法的实际应用。
2. 通过分析和模仿现有的代码实例，初学者可以更好地理解编程逻辑和算法的工作原理。
3. 代码实例往往涵盖了多种编程技巧和最佳实践，通过学习和模仿这些实例，学习者可以逐步掌握如何编写高效、可读性强和可维护的代码。这对于初学者来说，是一种快速提升编程水平的有效途径。


File.Open是C#的System.IO命名空间下中的一个方法, 小编为大家找了一些网络大拿们常见的代码示例，源码中的File.Open() 已经帮大家高亮显示了，大家可以重点学习File.Open() 方法的写法，从而快速掌握该方法的应用。

File.Open的代码示例1 - IniCheckPermissions()

    using System.IO;

        bool IniCheckPermissions()
        {
            bool deleteAfter = !File.Exists(IniFilename);
            bool hasPermission = false;

            try
            {
                using (FileStream fileStream = File.Open(IniFilename, FileMode.OpenOrCreate, FileAccess.Write))
                {
                    hasPermission = true;
                }
            }
            catch
            {
                hasPermission = false;
            }

            if (File.Exists(IniFilename) && deleteAfter)
                try
                {
                    File.Delete(IniFilename);
                }
                catch { }

            return hasPermission;
        }
    

开发者ID:emoose，项目名称:DLSSTweaks，代码行数:28，代码来源:Main.cs

在IniCheckPermissions()方法中，File的代码示例类中的Open的代码示例方法一共出现了1次， 见黄色背景高亮显示的地方，欢迎大家点赞

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File.Open的代码示例2 - FilesAreBufferedAndCanBeFlushed()

    using System.IO;

        [TestCaseSource(typeof(FileRunnersAndFolders), nameof(FileRunnersAndFolders.Runners))]
        public void FilesAreBufferedAndCanBeFlushed(FileSystemRunner fileSystem, string parentFolder)
        {
            string filename = Path.Combine(parentFolder, "FilesAreBufferedAndCanBeFlushed");
            string filePath = this.Enlistment.GetVirtualPathTo(filename);

            byte[] buffer = System.Text.Encoding.ASCII.GetBytes("Some test data");

            using (FileStream writeStream = File.Open(filePath, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.ReadWrite))
            {
                writeStream.Write(buffer, 0, buffer.Length);

                using (FileStream readStream = File.Open(filePath, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite))
                {
                    readStream.Length.ShouldEqual(0);
                    writeStream.Flush();
                    readStream.Length.ShouldEqual(buffer.Length);

                    byte[] readBuffer = new byte[buffer.Length];
                    readStream.Read(readBuffer, 0, readBuffer.Length).ShouldEqual(readBuffer.Length);
                    readBuffer.ShouldMatchInOrder(buffer);
                }
            }

            fileSystem.DeleteFile(filePath);
        }
    

开发者ID:microsoft，项目名称:VFSForGit，代码行数:28，代码来源:BasicFileSystemTests.cs

在FilesAreBufferedAndCanBeFlushed()方法中，File的代码示例类中的Open的代码示例方法一共出现了3次， 见黄色背景高亮显示的地方，欢迎大家点赞

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File.Open的代码示例3 - SavePersistedValue()

    using System.IO;

        private static void SavePersistedValue(string dotGVFSRoot, string key, string value)
        {
            string metadataPath = Path.Combine(dotGVFSRoot, RepoMetadataName);

            Dictionary repoMetadata = new Dictionary();
            string json;
            using (FileStream fs = new FileStream(metadataPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite | FileShare.Delete))
            using (StreamReader reader = new StreamReader(fs))
            {
                while (!reader.EndOfStream)
                {
                    json = reader.ReadLine();
                    json.Substring(0, 2).ShouldEqual("A ");

                    KeyValuePair kvp = JsonConvert.DeserializeObject>(json.Substring(2));
                    repoMetadata.Add(kvp.Key, kvp.Value);
                }
            }

            repoMetadata[key] = value;

            string newRepoMetadataContents = string.Empty;

            foreach (KeyValuePair kvp in repoMetadata)
            {
                newRepoMetadataContents += "A " + JsonConvert.SerializeObject(kvp).Trim() + "\r\n";
            }

            File.WriteAllText(metadataPath, newRepoMetadataContents);
        }
    

开发者ID:microsoft，项目名称:VFSForGit，代码行数:32，代码来源:GVFSHelpers.cs

在SavePersistedValue()方法中，File的代码示例类中的Open的代码示例方法一共出现了1次， 见黄色背景高亮显示的地方，欢迎大家点赞

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File.Open的代码示例4 - ServiceLogContainsUpgradeMessaging()

    using System.IO;

        private bool ServiceLogContainsUpgradeMessaging()
        {
            // This test checks for the upgrade timer start message in the Service log
            // file. GVFS.Service should schedule the timer as it starts.
            string expectedTimerMessage = "Checking for product upgrades. (Start)";
            string serviceLogFolder = Path.Combine(
                Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData),
                "GVFS",
                GVFSServiceProcess.TestServiceName,
                "Logs");
            DirectoryInfo logsDirectory = new DirectoryInfo(serviceLogFolder);
            FileInfo logFile = logsDirectory.GetFiles()
                .OrderByDescending(f => f.LastWriteTime)
                .FirstOrDefault();

            if (logFile != null)
            {
                using (StreamReader fileStream = new StreamReader(File.Open(logFile.FullName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)))
                {
                    string nextLine = null;
                    while ((nextLine = fileStream.ReadLine()) != null)
                    {
                        if (nextLine.Contains(expectedTimerMessage))
                        {
                            return true;
                        }
                    }
                }
            }

            return false;
        }
    

开发者ID:microsoft，项目名称:VFSForGit，代码行数:34，代码来源:GVFSUpgradeReminderTests.cs

在ServiceLogContainsUpgradeMessaging()方法中，File的代码示例类中的Open的代码示例方法一共出现了2次， 见黄色背景高亮显示的地方，欢迎大家点赞

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File.Open的代码示例5 - OpenFileThenCheckout()

    using System.IO;

        [TestCase]
        public void OpenFileThenCheckout()
        {
            string virtualFile = Path.Combine(this.Enlistment.RepoRoot, GitCommandsTests.EditFilePath);
            string controlFile = Path.Combine(this.ControlGitRepo.RootPath, GitCommandsTests.EditFilePath);

            // Open files with ReadWrite sharing because depending on the state of the index (and the mtimes), git might need to read the file
            // as part of status (while we have the handle open).
            using (FileStream virtualFS = File.Open(virtualFile, FileMode.OpenOrCreate, FileAccess.Write, FileShare.ReadWrite))
            using (StreamWriter virtualWriter = new StreamWriter(virtualFS))
            using (FileStream controlFS = File.Open(controlFile, FileMode.OpenOrCreate, FileAccess.Write, FileShare.ReadWrite))
            using (StreamWriter controlWriter = new StreamWriter(controlFS))
            {
                this.ValidateGitCommand("checkout -b tests/functional/OpenFileThenCheckout");
                virtualWriter.WriteLine("// Adding a line for testing purposes");
                controlWriter.WriteLine("// Adding a line for testing purposes");
                this.ValidateGitCommand("status");
            }

            // NOTE: Due to optimizations in checkout -b, the modified files will not be included as part of the
            // success message.  Validate that the succcess messages match, and the call to validate "status" below
            // will ensure that GVFS is still reporting the edited file as modified.

            string controlRepoRoot = this.ControlGitRepo.RootPath;
            string gvfsRepoRoot = this.Enlistment.RepoRoot;
            string command = "checkout -b tests/functional/OpenFileThenCheckout_2";
            ProcessResult expectedResult = GitProcess.InvokeProcess(controlRepoRoot, command);
            ProcessResult actualResult = GitHelpers.InvokeGitAgainstGVFSRepo(gvfsRepoRoot, command);
            GitHelpers.ErrorsShouldMatch(command, expectedResult, actualResult);
            actualResult.Errors.ShouldContain("Switched to a new branch");

            this.ValidateGitCommand("status");
        }
    

开发者ID:microsoft，项目名称:VFSForGit，代码行数:35，代码来源:GitCommandsTests.cs

在OpenFileThenCheckout()方法中，File的代码示例类中的Open的代码示例方法一共出现了2次， 见黄色背景高亮显示的地方，欢迎大家点赞

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File.Open的代码示例6 - OpenIndexForRead()

    using System.IO;

        public virtual FileSystemTaskResult OpenIndexForRead()
        {
            if (!File.Exists(this.indexPath))
            {
                EventMetadata metadata = CreateEventMetadata();
                this.context.Tracer.RelatedError(metadata, "AcquireIndexLockAndOpenForWrites: Can't open the index because it doesn't exist");

                return FileSystemTaskResult.FatalError;
            }

            this.projectionParseComplete.Wait();

            FileSystemTaskResult result = FileSystemTaskResult.FatalError;
            try
            {
                this.indexFileStream = new FileStream(this.indexPath, FileMode.Open, FileAccess.Read, FileShare.Read, IndexFileStreamBufferSize);
                result = FileSystemTaskResult.Success;
            }
            catch (IOException e)
            {
                EventMetadata metadata = CreateEventMetadata(e);
                this.context.Tracer.RelatedWarning(metadata, "IOException in AcquireIndexLockAndOpenForWrites (Retryable)");
                result = FileSystemTaskResult.RetryableError;
            }
            catch (Exception e)
            {
                EventMetadata metadata = CreateEventMetadata(e);
                this.context.Tracer.RelatedError(metadata, "Exception in AcquireIndexLockAndOpenForWrites (FatalError)");
                result = FileSystemTaskResult.FatalError;
            }

            return result;
        }
    

开发者ID:microsoft，项目名称:VFSForGit，代码行数:35，代码来源:GitIndexProjection.cs

在OpenIndexForRead()方法中，File的代码示例类中的Open的代码示例方法一共出现了1次， 见黄色背景高亮显示的地方，欢迎大家点赞

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File.Open的代码示例7 - SignIndex()

    using System.IO;

        private void SignIndex()
        {
            using (ITracer activity = this.tracer.StartActivity("SignIndex", EventLevel.Informational, Keywords.Telemetry, metadata: null))
            {
                using (FileStream fs = File.Open(this.indexPath, FileMode.Open, FileAccess.ReadWrite))
                {
                    // Truncate the old hash off. The Index class is expected to preserve any existing hash.
                    fs.SetLength(fs.Length - 20);
                    using (HashingStream hashStream = new HashingStream(fs))
                    {
                        fs.Position = 0;
                        hashStream.CopyTo(Stream.Null);
                        byte[] hash = hashStream.Hash;

                        // The fs pointer is now where the old hash used to be. Perfect. :)
                        fs.Write(hash, 0, hash.Length);
                    }
                }
            }
        }
    

开发者ID:microsoft，项目名称:VFSForGit，代码行数:22，代码来源:Index.cs

在SignIndex()方法中，File的代码示例类中的Open的代码示例方法一共出现了2次， 见黄色背景高亮显示的地方，欢迎大家点赞

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File.Open的代码示例8 - ModifiedPathsFromChangesInsideRepoSavedAfterRemount()

    using System.IO;

        [TestCaseSource(typeof(FileSystemRunner), nameof(FileSystemRunner.Runners))]
        public void ModifiedPathsFromChangesInsideRepoSavedAfterRemount(FileSystemRunner fileSystem)
        {
            string[] expectedModifiedFilesContentsAfterRemount =
                {
                    @"A .gitattributes",
                    $"A {GVFSHelpers.ConvertPathToGitFormat(FileToAdd)}",
                    $"A {GVFSHelpers.ConvertPathToGitFormat(FileToUpdate)}",
                    $"A {FileToDelete}",
                    $"A {GVFSHelpers.ConvertPathToGitFormat(FileToRename)}",
                    $"A {GVFSHelpers.ConvertPathToGitFormat(RenameFileTarget)}",
                    $"A {FolderToCreate}/",
                    $"A {RenameNewDotGitFileTarget}",
                    $"A {FolderToDelete}/",
                };

            string fileToAdd = this.Enlistment.GetVirtualPathTo(FileToAdd);
            fileSystem.WriteAllText(fileToAdd, "Contents for the new file");

            string fileToUpdate = this.Enlistment.GetVirtualPathTo(FileToUpdate);
            fileSystem.AppendAllText(fileToUpdate, "// Testing");

            string fileToDelete = this.Enlistment.GetVirtualPathTo(FileToDelete);
            fileSystem.DeleteFile(fileToDelete);
            fileToDelete.ShouldNotExistOnDisk(fileSystem);

            string fileToRename = this.Enlistment.GetVirtualPathTo(FileToRename);
            fileSystem.MoveFile(fileToRename, this.Enlistment.GetVirtualPathTo(RenameFileTarget));

            string folderToCreate = this.Enlistment.GetVirtualPathTo(FolderToCreate);
            fileSystem.CreateDirectory(folderToCreate);

            string folderToRename = this.Enlistment.GetVirtualPathTo(FolderToRename);
            fileSystem.CreateDirectory(folderToRename);
            string folderToRenameTarget = this.Enlistment.GetVirtualPathTo(RenameFolderTarget);
            fileSystem.MoveDirectory(folderToRename, folderToRenameTarget);

            // Deleting the new folder will remove it from the modified paths file
            fileSystem.DeleteDirectory(folderToRenameTarget);
            folderToRenameTarget.ShouldNotExistOnDisk(fileSystem);

            // Moving a file from the .git folder to the working directory should add the file to the modified paths
            string dotGitfileToAdd = this.Enlistment.GetVirtualPathTo(DotGitFileToCreate);
            fileSystem.WriteAllText(dotGitfileToAdd, "Contents for the new file in dot git");
            fileSystem.MoveFile(dotGitfileToAdd, this.Enlistment.GetVirtualPathTo(RenameNewDotGitFileTarget));

            string folderToDeleteFullPath = this.Enlistment.GetVirtualPathTo(FolderToDelete);
            fileSystem.WriteAllText(Path.Combine(folderToDeleteFullPath, "NewFile.txt"), "Contents for new file");
            string newFileToDelete = Path.Combine(folderToDeleteFullPath, "NewFileToDelete.txt");
            fileSystem.WriteAllText(newFileToDelete, "Contents for new file");
            fileSystem.DeleteFile(newFileToDelete);
            fileSystem.WriteAllText(Path.Combine(folderToDeleteFullPath, "CreateCommonVersionHeader.bat"), "Changing the file contents");
            fileSystem.DeleteFile(Path.Combine(folderToDeleteFullPath, "RunUnitTests.bat"));

            fileSystem.DeleteDirectory(folderToDeleteFullPath);
            folderToDeleteFullPath.ShouldNotExistOnDisk(fileSystem);

            // Remount
            this.Enlistment.UnmountGVFS();
            this.Enlistment.MountGVFS();

            this.Enlistment.WaitForBackgroundOperations();

            string modifiedPathsDatabase = Path.Combine(this.Enlistment.DotGVFSRoot, TestConstants.Databases.ModifiedPaths);
            modifiedPathsDatabase.ShouldBeAFile(fileSystem);
            using (StreamReader reader = new StreamReader(File.Open(modifiedPathsDatabase, FileMode.Open, FileAccess.Read, FileShare.ReadWrite)))
            {
                reader.ReadToEnd().Split(new char[] { '\r', '\n' }, StringSplitOptions.RemoveEmptyEntries).OrderBy(x => x)
                    .ShouldMatchInOrder(expectedModifiedFilesContentsAfterRemount.OrderBy(x => x));
            }
        }
    

开发者ID:microsoft，项目名称:VFSForGit，代码行数:73，代码来源:ModifiedPathsTests.cs

在ModifiedPathsFromChangesInsideRepoSavedAfterRemount()方法中，File的代码示例类中的Open的代码示例方法一共出现了2次， 见黄色背景高亮显示的地方，欢迎大家点赞

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