How to convert string to any type

Question

I want to convert a string to a generic type

I have this:

string inputValue = myTxtBox.Text; PropertyInfo propInfo = typeof(MyClass).GetProperty(myPropertyName); Type propType = propInfo.PropertyType; object propValue = ?????

I want to convert 'inputString' to the type of that property, to check if it's compatible how can I do that?

tks

catfood · Accepted Answer · 2014-04-30 15:03:07Z

128

using System.ComponentModel; TypeConverter typeConverter = TypeDescriptor.GetConverter(propType); object propValue = typeConverter.ConvertFromString(inputValue);

edited Apr 30, 2014 at 15:03

catfood

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answered May 27, 2010 at 16:27

Lee

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4 Comments

The Muffin Man Over a year ago

I'm surprised that this one gets the upvotes compared to Convert.ChangeType.

efdee Over a year ago

Probably because ChangeType tries to cast, not convert. For example, ChangeType can't go from String to Nullable<Int64> - TypeConverter can.

TodoCleverNameHere Over a year ago

Nor can it handle automatic parsing of enums

Bassie Over a year ago

Convert.ChangeType also fails for string -> Guid

default · Accepted Answer · 2012-08-22 08:42:23Z

16

Try Convert.ChangeType

object propvalue = Convert.ChangeType(inputValue, propType);

edited Aug 22, 2012 at 8:42

default

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answered May 27, 2010 at 16:24

SWeko

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5 Comments

Steve Guidi Over a year ago

This is really a comment, not an answer to the question. Please use "add comment" to leave feedback for the author.

SWeko Over a year ago

@SteveGuidi: Default already edited the answer in the meantime, tnx to both.

default Over a year ago

@SWeko it's the default reply when editing via the review page (and this question was there for both of us). I just edited it instead.

The Muffin Man Over a year ago

This is really the the proper way to do it.

Andy Mudrak Over a year ago

I know there's another accept answer, but wanted to clarify why this is not: there's no way to convert a string to another type that's not a built-in value type using Convert.ChangeType(). This will use IConvertible.ToType() on the String type, which is implemented as calling internal method Convert.DefaultToType(), which throws an exception if the type to convert to is not a built-in value type. (referencesource.microsoft.com/#mscorlib/system/…)

vtortola · Accepted Answer · 2010-05-27 16:25:22Z

I don't really think I understand what your are trying to archieve, but.. you mean a dynamic casting? Something like this:

 TypeDescriptor.GetConverter(typeof(String)).ConvertTo(myObject, typeof(Program));

Cheers.

Chintan Ranpura · Accepted Answer · 2024-02-03 07:56:48Z

string inputValue = myTxtBox.Text; PropertyInfo propInfo = typeof(MyClass).GetProperty(myPropertyName); Type propType = propInfo.PropertyType; propInfo.SetValue(myObject, Convert.ChangeType(inputValue, propType));

Here "myObject" is an instance of the class "MyClass", for which you want to set the property value generically.

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