Custom adapter with custom Editor

Hi,
 
Thanks for the reply. Not what I wanted to hear 🙂 but at least I don't have to search for it any more.

The reason why I wanted to use this is because I had a problem with empty property values as I don't want to use the context menu to "Nullify" the property. I found a nice workaround though and therefore post it here:

This a converter that converts an empty value (user input) into a empty-placeholder-string (datastorage) when a user enters a value (and the other way around for display the value). In the adaptercode the value must be checked for this placeholder to reset it to string.Empty.

This is the reference in the schema: 

<xs:element name="ConfigDBStoredProcedure" type="xs:string">
    <xs:annotation>
        <xs:appinfo>
            <baf:designer xmlns:baf="BiztalkAdapterFramework.xsd">
                <baf:displayname _locID="ConfigDBStoredProcedureName">Edit this field in the resource file</baf:displayname>
                <baf:description _locID="ConfigDBStoredProcedureDesc">Edit this field in the resource file</baf:description>
                <baf:category _locID="ConfigDB"></baf:category>
                <baf:converter>ASSEMBLY.EmptyPlaceholderConverter, AdapterUIEditors, Version=1.0.0.0, Culture=neutral, PublicKeyToken=…, processorArchitecture=MSIL</baf:converter>
            </baf:designer>
        </xs:appinfo>
    </xs:annotation>
</xs:element>
 

This is the addionaly class:

using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Diagnostics;

namespace GlobalRefund.B2B.DeepFileAdapter.UIEditors
{
    public class EmptyPlaceholderConverter : TypeConverter
    {
        public const string EmptyPlaceholder = "!!##EmptyPlaceholder##!!";

        // From input to datastorage
        public override object ConvertFrom(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value)
        {
            EventLog.WriteEntry("EmptyToNullConverter", "ConvertFrom " + (value == null ? "null" : value.ToString()) + " " + value.GetType().ToString());
            if (value is string && (string)value == string.Empty) return EmptyPlaceholder;
            return value;
        }

        // from datastorage to input
        public override object ConvertTo(ITypeDescriptorContext context, System.Globalization.CultureInfo culture, object value, Type destinationType)
        {
            EventLog.WriteEntry("EmptyToNullConverter", "ConvertTo " + (value == null ? "null" : value.ToString()));
            if (value == null || (value is string && (string)value == EmptyPlaceholder)) return string.Empty;
            return value;
        }
    }
}

And this is the usage in the adapter:

string rootFolder = Extract(document, "Config/RootFolder");
if (rootFolder == EmptyPlaceholderConverter.EmptyPlaceholder) rootFolder = string.Empty; 

hope this helps others with the same problem 🙂