最有用的.NET实用程序类开发人员倾向于重新发明而不是重用

试图找出我的文档在用户计算机上的位置.只需使用以下内容:

string directory =
Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

我最近需要在Windows应用程序中下载一些文件.我在WebClient对象上找到了DownloadFile方法:

    WebClient wc = new WebClient();
    wc.DownloadFile(sourceURLAddress, destFileName);

硬编码a/into目录操作字符串与使用:

IO.Path.DirectorySeparatorChar

该StringBuilder的类,特别是法AppendFormat.

PS:如果您正在寻找字符串操作性能测量: StringBuilder与使用.NET 2.0的字符串/快速字符串操作

Environment.NewLine

不要使用Guid生成文件名,只需使用:

Path.GetRandomFileName()

很多新的Linq功能似乎都很不为人知:

Any() & All()

if( myCollection.Any( x => x.IsSomething ) )
    //...

bool allValid = myCollection.All( 
    x => x.IsValid );

ToList(), ToArray(), ToDictionary()

var newDict = myCollection.ToDictionary(
    x => x.Name,
    x => x.Value );

First(), FirstOrDefault()

return dbAccessor.GetFromTable( id ).
    FirstOrDefault();

Where()

//instead of
foreach( Type item in myCollection )
    if( item.IsValid )
         //do stuff

//you can also do
foreach( var item in myCollection.Where( x => x.IsValid ) )
    //do stuff

//note only a simple sample - the logic could be a lot more complex

您可以在Linq语法之外使用的所有非常有用的小函数.

使用DebuggerDisplay属性而不是ToString()来简化调试.

Enumerable.Range

来自FSharp.Core的元组!

System.Text.RegularExpressions.Regex

input.StartsWith("stuff") 代替 Regex.IsMatch(input, @"^stuff")

请参阅隐藏的.NET基类库类

For all it's hidden away under the Microsoft.VisualBasic namespace, TextFieldParser is actually a very nice csv parser. I see a lot of people either roll their own (badly) or use something like the nice Fast CSV library on Code Plex, not even knowing this is already baked into the framework.

文件的东西.

using System.IO;

File.Exists(FileNamePath)

Directory.Exists(strDirPath)

File.Move(currentLocation, newLocation);

File.Delete(fileToDelete);

Directory.CreateDirectory(directory)

System.IO.FileStream file = System.IO.File.Create(fullFilePath);

System.IO.File.ReadAllText vs使用StreamReader为小文件编写逻辑.

System.IO.File.WriteAllText vs使用StreamWriter为小文件编写逻辑.