下表显示了 Visual Basic 数据类型、其支持的公共语言运行时类型、其名义存储分配及其值范围。 展开表 Visual Basic 类型公共语言运行时类型结构名义存储分配取值范围 布尔值Boolean取决于实现平台True或False ByteByte1 个字节0 到 255(未签名) Char(单个字符)Char2 个字节0 到 65535(未签名) ...
Function convert(ByVal b As Byte)As String For a list of Visual Basic data types, seeData Types. Additional resources Training Module Choose the correct data type in your C# code - Training Choose the correct data type for your code from several basic types used in C#....
オートメーションまたは COM オブジェクトのように、.NET Framework 向けに作成されていないコンポーネントとやり取りする場合、他の環境の日付/時刻の型は Visual Basic の Date 型と互換性がないことに注意してください。 そのようなコンポーネントに日付/時刻の引数を渡す場合は、新しい ...
For more information on when to define a generic type, see Generic Types in Visual Basic. For more information on type parameter names, see Declared Element Names.RulesParentheses. If you supply a type parameter list, you must enclose it in parentheses, and you must introduce the list with ...
In this part of the Visual Basic tutorial, we talk about data types. Computer programs work with data. Tools to work with various data types are essential part of a modern computer language. According to the Wikipedia definition, adata typeis a set of values, and the allowable operations on...
有关约束的详细信息,请参阅 Type List。多个约束的示例下面的示例演示了带有类型形参约束列表的泛型类的主干定义。 在创建此类的实例的代码中,类型实参必须实现 IComparable 和IDisposable 接口,必须是引用类型,并且必须公开一个可访问的无参数构造函数。VB 复制 ...
If you must convert aBooleanvalue to a numeric data type, be careful about which conversion method you use. Character Literal Generates Compiler Error In the absence of any type characters, Visual Basic assumes default data types for literals. The default type for a character literal — enclosed...
For a more complete example, see How to: Define a Class That Can Provide Identical Functionality on Different Data Types (Visual Basic).Eligible Programming ElementsYou can define and use generic classes, structures, interfaces, procedures, and delegates. Note that the .NET Framework defines ...
'* set up the variable's data type, input/output characteristics, * '* length, and initial value. * '* The SQLDescribeParam API can optionally be used to retrieve the '* parameter types. '* * '* To properly pass an array of byte to a stored procedure and receive * ...
Nullable Types Relaxed Delegates Conclusion Introduction Visual Basic has always centered on building pragmatic, data-oriented, line of business applications. While the move to .NET brought the power of aunifiedframework and a managed platform to the application developer, the next release of Visual ...