Set a custom drawing property

[dennis]

I have a custom drawing property called: MyCustom and set it value to "This".  Via C# I want to change the value to "That".  Currently I have the code to enumerate through the Database.SummaryInfo.CustomProperties which gets me down to MyCustom, but now "how" to change the value.  That I cannot figure out.  I can find how to create new custom properties, but I can't seem to find how to just change the value.  I hoped it would be as simple as just setting the value, but that isn't working.  So below is my code, that alas, is not working.  I experimented around using:

DatabaseSummaryInfoBuilder dpbuilder = new DatabaseSummaryInfoBuilder();

But can't see how to use it except for creating new custom properties.

public static void setDwgProp(Database acDb, string dwgprop, string propval)

{

  IDictionaryEnumerator denum = acDb.SummaryInfo.CustomProperties;

  using (Transaction acTrans = acDb.TransactionManager.StartTransaction())

   {

    while (denum.MoveNext())

       {

      DictionaryEntry entry = denum.Entry;

      if (entry.Key.ToString().ToUpper() == dwgprop.ToUpper())

           {

              entry.Value = propval;

           }

      }

      acTrans.Commit();

   }

}

Tangent question, how can I copy/paste my code so that it formats for easy reading?

[_gile · Accepted solution]

Hi,

Here're some extension methods

using System.Collections;
using System.Collections.Generic;

namespace Autodesk.AutoCAD.DatabaseServices
{
    /// <summary>
    /// Provides extension methods for the Database type
    /// </summary>
    public static class DatabaseExtension
    {
        /// <summary>
        /// Gets the drawing custom properties.
        /// </summary>
        /// <param name="db">Database instance this method applies to.</param>
        /// <returns>A strongly typed dictionary containing the entries.</returns>
        public static Dictionary<string, string> GetCustomProperties(this Database db)
        {
            Dictionary<string, string> result = new Dictionary<string, string>();
            IDictionaryEnumerator dictEnum = db.SummaryInfo.CustomProperties;
            while (dictEnum.MoveNext())
            {
                DictionaryEntry entry = dictEnum.Entry;
                result.Add((string)entry.Key, (string)entry.Value);
            }
            return result;
        }

        /// <summary>
        /// Gets a drawing custom property.
        /// </summary>
        /// <param name="db">Database instance this method applies to.</param>
        /// <param name="key">Property key.</param>
        /// <returns>The property value or null if not found</returns>
        public static string GetCustomProperty(this Database db, string key)
        {
            DatabaseSummaryInfoBuilder sumInfo = new DatabaseSummaryInfoBuilder(db.SummaryInfo);
            IDictionary custProps = sumInfo.CustomPropertyTable;
            return (string)custProps[key];
        }

        /// <summary>
        /// Sets a property value
        /// </summary>
        /// <param name="db">Database instance this method applies to.</param>
        /// <param name="key">Property key.</param>
        /// <param name="value">Property value.</param>
        public static void SetCustomProperty(this Database db, string key, string value)
        {
            DatabaseSummaryInfoBuilder infoBuilder = new DatabaseSummaryInfoBuilder(db.SummaryInfo);
            IDictionary custProps = infoBuilder.CustomPropertyTable;
            if (custProps.Contains(key))
                custProps[key] = value;
            else
                custProps.Add(key, value);
            db.SummaryInfo = infoBuilder.ToDatabaseSummaryInfo();
        }
    }
}

---

dennis a écrit :

Tangent question, how can I copy/paste my code so that it formats for easy reading?

---

When wrting your message, click on the "insert code" button [</>] and paste your code in the dialog box.

[dennis]

Thank you Giles.  Solution looks simple now that you showed me.  I did keep some of the code I wrote using the Enumerator because I wanted to avoid the uppercase/lowercase problem.

        public static void setDwgProp(Database acDb, string propkey, string propval)
        {
            IDictionaryEnumerator denum = acDb.SummaryInfo.CustomProperties;
            while (denum.MoveNext())
            {
                DictionaryEntry entry = denum.Entry;
                if (entry.Key.ToString().ToUpper() == propkey.ToUpper())
                {
                    DatabaseSummaryInfoBuilder dpbuilder = new DatabaseSummaryInfoBuilder(acDb.SummaryInfo);
                    IDictionary customProps = dpbuilder.CustomPropertyTable;
                    if (customProps.Contains(entry.Key))
                    {
                        customProps[entry.Key] = propval;
                    }
                    acDb.SummaryInfo = dpbuilder.ToDatabaseSummaryInfo();
                }
            }
        }