In generic use, resolve type conversion issues

The problem is that the system has a field of character type to store some common system configurations, although the form of storage is a string, but the actual type used in the system may be string, bool, int, decimal.

This is the time to write a common method to get a variety of different types of return values, of course, the idea is to use generics. So the definition of this method is probably this:

T getvalue<t> (string key)

This approach involves the conversion of a string type into a generic type.

 Public T getsingleconfigvalue<t>(econfigkeyname key, T defaultvalue) {      var config = getconfig (key)       return (T) config;

Using the above method directly, the following compilation error will occur.

Check the data, the correct way is to use the Convert.changetype method:

typeof (T));

In generic use, resolve type conversion issues