[C# Tutorial] C# Type Conversion

C# Type Conversion

Type conversion is fundamentally type casting, or converting data from one type to another. In C#, type casting comes in two forms:

Implicit type conversions - these are the default conversions that C# performs in a safe manner. For example, converting from a small integer type to a large integer type, and from a derived class to a base class.

Explicit type conversions - These conversions are done explicitly by the user using predefined functions. Explicit conversion requires a cast operator.

The following example shows an explicit type conversion:

namespace TypeConversionApplication
{
    class ExplicitConversion
    {
        static void Main(string[] args)
        {
            double d = 5673.74;
            int i;

            // 强制转换 double 为 int
            i = (int)d;
            Console.WriteLine(i);
            Console.ReadKey();
            
        }
    }
}

When the above code is compiled and executed, it produces the following results:

5673

C# type Conversion Methods

C# provides the following built-in type conversion methods:

Serial Number

Method& Description

1 ToBoolean
Convert the type to Boolean if possible.

2 ToByte
Convert the type to byte type.

3 ToChar
Convert the type to a single Unicode character type if possible.

4 ToDateTime
Convert the type (integer or string type) to a date-time structure.

5 ToDecimal
Convert floating point or integer type to decimal type.

6 ToDouble
Convert the type to double precision floating point type.

7 ToInt16
Convert the type to a 16-bit integer type.

8 ToInt32
Convert the type to a 32-bit integer type.

9 ToInt64
Convert the type to a 64-bit integer type.

10 ToSbyte
Convert the type to a signed byte type.

11 ToSingle
Convert the type to a small floating point number type.

12 ToString
Convert the type to string type.

13 ToType
Convert the type to the specified type.

14 ToUInt16
Convert the type to a 16-bit unsigned integer type.

15 ToUInt32
Convert the type to a 32-bit unsigned integer type.

16 ToUInt64
Convert the type to a 64-bit unsigned integer type.

The following example converts different value types into string types:

namespace TypeConversionApplication
{
    class StringConversion
    {
        static void Main(string[] args)
        {
            int i = 75;
            float f = 53.005f;
            double d = 2345.7652;
            bool b = true;

            Console.WriteLine(i.ToString());
            Console.WriteLine(f.ToString());
            Console.WriteLine(d.ToString());
            Console.WriteLine(b.ToString());
            Console.ReadKey();
            
        }
    }
}

When the above code is compiled and executed, it produces the following results:

75
53.005
2345.7652
True

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