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public static string ToTrimmedString(this DataRow row, string columnName)
{
return row[columnName].ToString().Trim();
}
Compiles fine but it doesn't show up in intellisense of the DataRow...
544
Extension methods enable you to "add" methods to existing types without creating a new derived type, recompiling, or otherwise modifying the original type. Extension methods are static methods, but they're called as if they were instance methods on the extended type.
To define and call the extension methodDefine a static class to contain the extension method. The class must be visible to client code. For more information about accessibility rules, see Access Modifiers. Implement the extension method as a static method with at least the same visibility as the containing class.
In C#, the extension method concept allows you to add new methods in the existing class or in the structure without modifying the source code of the original type and you do not require any kind of special permission from the original type and there is no need to re-compile the original type.
An extension method is actually a special kind of static method defined in a static class. To define an extension method, first of all, define a static class. For example, we have created an IntExtensions class under the ExtensionMethods namespace in the following example.
My guess is you haven't included the namespace.
64
Ensure this method is in a static class of its own, separate class from the consuming DataRow.
namespace MyProject.Extensions
{
public static class DataRowExtensions
{
//your extension methods
}
}
In your consumer, ensure you're:
using MyProject.Extensions
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