, openWith["rtf"]); // The indexer can be used to change the value associated // with a key. openWith["rtf"] = "winword.exe"; Console.WriteLine("For key = \"rtf\", value = {0}.", openWith["rtf"]); // If a key does not exist, setting the indexer for that key // ...
Each addition to the dictionary consists of a value and its associated key. Retrieving a value by using its key is very fast, close to O(1), because the Dictionary<TKey,TValue> class is implemented as a hash table.Note The speed of retrieval depends on the quality of the hashing ...
下面的代码示例使用字符串键创建一个空的字符串 Dictionary<TKey,TValue>,并使用 Add 方法添加一些元素。 该示例演示 Add 方法在尝试添加重复键时引发 ArgumentException。该示例使用 Item[] 属性(C# 中的索引器)检索值,演示请求的键不存在时引发 KeyNotFoundException,并显示可以替换与键关联的值。
下面的代码示例使用字符串键创建一个空的字符串 SortedDictionary<TKey,TValue>,并使用 Add 方法添加一些元素。 该示例演示 Add 方法在尝试添加重复键时引发 ArgumentException。该示例使用 Item[] 属性(C# 中的索引器)检索值,演示请求的键不存在时引发 KeyNotFoundException,并显示可以替换与键关联的值。该示例演示...
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LargeObject large = lazyLargeObject.Value; Lazy<T> 类提供锁定,以便只允许一个线程创建 LargeObject 实例。 该示例演示其他线程都获得相同的实例。 备注 为简单起见,此示例使用 Lazy<T>的全局实例,所有方法都 static(Visual Basic 中的Shared)。 这些不是使用延迟初始化的要求。 C# 复制 using System; usin...
derived_table is used as input to the outer query. derived_table can use the Transact-SQL table value constructor feature to specify multiple rows. For example, SELECT * FROM (VALUES (1, 2), (3, 4), (5, 6), (7, 8), (9, 10) ) AS MyTable(a, b);. For more information, ...
The most significant 11 bits are the value of the symbol set “number” field. The value of the least significant 5 bits, when added to 64, is the ASCII value of the symbol set “ID” field. Symbol set values are assigned by HP Boise Division. Unbound fonts, or “typefaces” should...
教程文档SAP常用最全T-CODETABLE.pdf,Table Application Data Table Type Class Class Description BKPF TRANSP FB Transaction 会计核算凭证:抬头 BNKA TRANSP FB Master 银行主记录 BSAD TRANSP FB Transaction 会计核算凭证:客户欠款已清项的凭证编号和行项目明细 BSAK