Is there any way to create a function that can change the data type of a variable?

I 'm new to C#. Is there any way to create a function that can change the datatype of a variable to an another datatype and return the changed value.

For example :

Let's assume that ChangeDataType is the name of the function. It should also be possible to do the same thing with all datatypes.

int a = 5;



float b = ChangeDataType(a, "float"); // 5.0

Thanks.

asked Jan 1 at 10:09

Roshan Kumar

218

2

Well, you could use function from class Convert, for example Convert.ChangeType() or Convert.ToSingle()

– Fabjan
Jan 1 at 10:16

Fabjan, I want create a function like that without using the built-in.

– Roshan Kumar
Jan 1 at 10:19

4

Well, look at the source code of the built-in, and do the same...

– GSerg
Jan 1 at 10:24

Please refer my below answer - you can use implicit or explicit operators for that. One of the examaple of code is already present on stackoverflow at: this link

– Manoj Choudhari
Jan 1 at 10:25

2

Just for curiosity: Why are you avoiding the built-in functions? Unlike in C++, the C# compiler comes with built-in libraries of which you can assume that they are always there.

– PMF
Jan 1 at 10:56

|
show 4 more comments

I 'm new to C#. Is there any way to create a function that can change the datatype of a variable to an another datatype and return the changed value.

For example :

Let's assume that ChangeDataType is the name of the function. It should also be possible to do the same thing with all datatypes.

int a = 5;



float b = ChangeDataType(a, "float"); // 5.0

Thanks.

asked Jan 1 at 10:09

Roshan Kumar

218

2

Well, you could use function from class Convert, for example Convert.ChangeType() or Convert.ToSingle()

– Fabjan
Jan 1 at 10:16

Fabjan, I want create a function like that without using the built-in.

– Roshan Kumar
Jan 1 at 10:19

4

Well, look at the source code of the built-in, and do the same...

– GSerg
Jan 1 at 10:24

Please refer my below answer - you can use implicit or explicit operators for that. One of the examaple of code is already present on stackoverflow at: this link

– Manoj Choudhari
Jan 1 at 10:25

2

Just for curiosity: Why are you avoiding the built-in functions? Unlike in C++, the C# compiler comes with built-in libraries of which you can assume that they are always there.

– PMF
Jan 1 at 10:56

|
show 4 more comments

I 'm new to C#. Is there any way to create a function that can change the datatype of a variable to an another datatype and return the changed value.

For example :

Let's assume that ChangeDataType is the name of the function. It should also be possible to do the same thing with all datatypes.

int a = 5;



float b = ChangeDataType(a, "float"); // 5.0

Thanks.

asked Jan 1 at 10:09

Roshan Kumar

218

I 'm new to C#. Is there any way to create a function that can change the datatype of a variable to an another datatype and return the changed value.

For example :

Let's assume that ChangeDataType is the name of the function. It should also be possible to do the same thing with all datatypes.

int a = 5;



float b = ChangeDataType(a, "float"); // 5.0

Thanks.

asked Jan 1 at 10:09

Roshan Kumar

218

asked Jan 1 at 10:09

Roshan Kumar

218

asked Jan 1 at 10:09

Roshan Kumar

218

asked Jan 1 at 10:09

Roshan Kumar

218

asked Jan 1 at 10:09

Roshan Kumar

218

2

Well, you could use function from class Convert, for example Convert.ChangeType() or Convert.ToSingle()

– Fabjan
Jan 1 at 10:16

Fabjan, I want create a function like that without using the built-in.

– Roshan Kumar
Jan 1 at 10:19

4

Well, look at the source code of the built-in, and do the same...

– GSerg
Jan 1 at 10:24

Please refer my below answer - you can use implicit or explicit operators for that. One of the examaple of code is already present on stackoverflow at: this link

– Manoj Choudhari
Jan 1 at 10:25

2

Just for curiosity: Why are you avoiding the built-in functions? Unlike in C++, the C# compiler comes with built-in libraries of which you can assume that they are always there.

– PMF
Jan 1 at 10:56

|
show 4 more comments

2

Well, you could use function from class Convert, for example Convert.ChangeType() or Convert.ToSingle()

– Fabjan
Jan 1 at 10:16

Fabjan, I want create a function like that without using the built-in.

– Roshan Kumar
Jan 1 at 10:19

4

Well, look at the source code of the built-in, and do the same...

– GSerg
Jan 1 at 10:24

Please refer my below answer - you can use implicit or explicit operators for that. One of the examaple of code is already present on stackoverflow at: this link

– Manoj Choudhari
Jan 1 at 10:25

2

Just for curiosity: Why are you avoiding the built-in functions? Unlike in C++, the C# compiler comes with built-in libraries of which you can assume that they are always there.

– PMF
Jan 1 at 10:56

Well, you could use function from class Convert, for example Convert.ChangeType() or Convert.ToSingle()

– Fabjan
Jan 1 at 10:16

Fabjan, I want create a function like that without using the built-in.

– Roshan Kumar
Jan 1 at 10:19

Well, look at the source code of the built-in, and do the same...

– GSerg
Jan 1 at 10:24

Please refer my below answer - you can use implicit or explicit operators for that. One of the examaple of code is already present on stackoverflow at: this link

– Manoj Choudhari
Jan 1 at 10:25

Just for curiosity: Why are you avoiding the built-in functions? Unlike in C++, the C# compiler comes with built-in libraries of which you can assume that they are always there.

– PMF
Jan 1 at 10:56

|
show 4 more comments

1 Answer
1

active

oldest

votes

Please note that you cannot change data type of already declared variable. But you can create new variable of desired type and then typecast old variable into new one. If this type casting fails, then invalidcastexception is thrown.

Below are different kinds of typecasting options:

1. Implicit Type casting
In this you don't need to use any syntax.
For ex:

int i = 10;

float a = i;

2. Explicit Type casting
You need to specify the type in which you want to convert to. For ex:

class Test

{

    static void Main()

    {

        double x = 1234.7;

        int a;

        // Cast double to int.

        a = (int)x;

        System.Console.WriteLine(a);

    }

}

// Output: 1234

3. User Defined Casts
Using implict and explicit keywords in c#.
Please refer

4. Helper Classes
There are many classes which provides method to convert data types.
One of the important class is - Convert.
This class provides a lot of methods. Convert.ToString, Convert.ToInt32, etc.
Another example is TryParse methods in int, long, double, DateTime, etc classes. Please refer

edited Jan 1 at 10:43

J Sushil

645720

answered Jan 1 at 10:22

Manoj Choudhari

1,9881616

1

This is not a helpful answer. Items 1, 2 and 3 are not what the OP is asking about (they want to provide the target type dynamically). Item 4 is about the Convert class that the OP rejected before this answer was posted.

– GSerg
Jan 1 at 13:05

2

It may not be the answer the OP wants, but in this case I think it is helpful. The OP is new to C# and is familiar with Python, a dynamically typed language, so part of a helpful answer is directing to how the language works.

– Scott Hannen
Jan 1 at 16:44

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

Below are different kinds of typecasting options:

1. Implicit Type casting
In this you don't need to use any syntax.
For ex:

int i = 10;

float a = i;

2. Explicit Type casting
You need to specify the type in which you want to convert to. For ex:

class Test

{

    static void Main()

    {

        double x = 1234.7;

        int a;

        // Cast double to int.

        a = (int)x;

        System.Console.WriteLine(a);

    }

}

// Output: 1234

3. User Defined Casts
Using implict and explicit keywords in c#.
Please refer

edited Jan 1 at 10:43

J Sushil

645720

answered Jan 1 at 10:22

Manoj Choudhari

1,9881616

1

This is not a helpful answer. Items 1, 2 and 3 are not what the OP is asking about (they want to provide the target type dynamically). Item 4 is about the Convert class that the OP rejected before this answer was posted.

– GSerg
Jan 1 at 13:05

2

It may not be the answer the OP wants, but in this case I think it is helpful. The OP is new to C# and is familiar with Python, a dynamically typed language, so part of a helpful answer is directing to how the language works.

– Scott Hannen
Jan 1 at 16:44

add a comment |

Below are different kinds of typecasting options:

1. Implicit Type casting
In this you don't need to use any syntax.
For ex:

int i = 10;

float a = i;

2. Explicit Type casting
You need to specify the type in which you want to convert to. For ex:

class Test

{

    static void Main()

    {

        double x = 1234.7;

        int a;

        // Cast double to int.

        a = (int)x;

        System.Console.WriteLine(a);

    }

}

// Output: 1234

3. User Defined Casts
Using implict and explicit keywords in c#.
Please refer

edited Jan 1 at 10:43

J Sushil

645720

answered Jan 1 at 10:22

Manoj Choudhari

1,9881616

1

This is not a helpful answer. Items 1, 2 and 3 are not what the OP is asking about (they want to provide the target type dynamically). Item 4 is about the Convert class that the OP rejected before this answer was posted.

– GSerg
Jan 1 at 13:05

2

It may not be the answer the OP wants, but in this case I think it is helpful. The OP is new to C# and is familiar with Python, a dynamically typed language, so part of a helpful answer is directing to how the language works.

– Scott Hannen
Jan 1 at 16:44

add a comment |

Below are different kinds of typecasting options:

1. Implicit Type casting
In this you don't need to use any syntax.
For ex:

int i = 10;

float a = i;

2. Explicit Type casting
You need to specify the type in which you want to convert to. For ex:

class Test

{

    static void Main()

    {

        double x = 1234.7;

        int a;

        // Cast double to int.

        a = (int)x;

        System.Console.WriteLine(a);

    }

}

// Output: 1234

3. User Defined Casts
Using implict and explicit keywords in c#.
Please refer

edited Jan 1 at 10:43

J Sushil

645720

answered Jan 1 at 10:22

Manoj Choudhari

1,9881616

Below are different kinds of typecasting options:

1. Implicit Type casting
In this you don't need to use any syntax.
For ex:

int i = 10;

float a = i;

2. Explicit Type casting
You need to specify the type in which you want to convert to. For ex:

class Test

{

    static void Main()

    {

        double x = 1234.7;

        int a;

        // Cast double to int.

        a = (int)x;

        System.Console.WriteLine(a);

    }

}

// Output: 1234

3. User Defined Casts
Using implict and explicit keywords in c#.
Please refer

edited Jan 1 at 10:43

J Sushil

645720

answered Jan 1 at 10:22

Manoj Choudhari

1,9881616

edited Jan 1 at 10:43

J Sushil

645720

edited Jan 1 at 10:43

J Sushil

645720

edited Jan 1 at 10:43

J Sushil

645720

answered Jan 1 at 10:22

Manoj Choudhari

1,9881616

answered Jan 1 at 10:22

Manoj Choudhari

1,9881616

answered Jan 1 at 10:22

Manoj Choudhari

1,9881616

1

This is not a helpful answer. Items 1, 2 and 3 are not what the OP is asking about (they want to provide the target type dynamically). Item 4 is about the Convert class that the OP rejected before this answer was posted.

– GSerg
Jan 1 at 13:05

2

It may not be the answer the OP wants, but in this case I think it is helpful. The OP is new to C# and is familiar with Python, a dynamically typed language, so part of a helpful answer is directing to how the language works.

– Scott Hannen
Jan 1 at 16:44

add a comment |

1

This is not a helpful answer. Items 1, 2 and 3 are not what the OP is asking about (they want to provide the target type dynamically). Item 4 is about the Convert class that the OP rejected before this answer was posted.

– GSerg
Jan 1 at 13:05

2

It may not be the answer the OP wants, but in this case I think it is helpful. The OP is new to C# and is familiar with Python, a dynamically typed language, so part of a helpful answer is directing to how the language works.

– Scott Hannen
Jan 1 at 16:44

This is not a helpful answer. Items 1, 2 and 3 are not what the OP is asking about (they want to provide the target type dynamically). Item 4 is about the Convert class that the OP rejected before this answer was posted.

– GSerg
Jan 1 at 13:05

It may not be the answer the OP wants, but in this case I think it is helpful. The OP is new to C# and is familiar with Python, a dynamically typed language, so part of a helpful answer is directing to how the language works.

– Scott Hannen
Jan 1 at 16:44

add a comment |

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