static public DataSetTypeMap GetDataSetTypeMap(Type type)
{
lock (DataSetTypeMaps)
{
// add to cache to avoid recreating type properties via .NET Reflection
if (DataSetTypeMaps.ContainsKey(type))
{
return(DataSetTypeMaps[type]);
}
DataSetTypeMap dataTypeMap = new DataSetTypeMap()
{
ElementType = type, Properties = new List <DataSetTypeMapProperty>()
};
foreach (PropertyInfo property in type.GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.GetProperty))
{
// avoid indexers
if (property.GetIndexParameters().Length > 0)
{
continue;
}
dataTypeMap.Properties.Add(new DataSetTypeMapProperty()
{
Property = property, DataType = GetBestAllowableTableType(property.PropertyType)
});
}
DataSetTypeMaps.Add(type, dataTypeMap);
return(dataTypeMap);
}
}
static public DataSet PopulateDataSet(params IEnumerable[] enumerables)
{
// 4/13/14 MRC - added check for null enumerables
if (enumerables == null || enumerables.Length == 0)
{
return(new DataSet("Empty"));
}
HashSet <string> tableNames = new HashSet <string>();
DataSet ds = new DataSet();
try
{
Int32 idx = 0;
foreach (IEnumerable enumerable in enumerables)
{
Type dictionarykeyType = null;
Object[] dictionaryKeys = null;
Boolean isDictionary = (enumerable is IDictionary);
if (isDictionary)
{
IDictionary dictionary = enumerable as IDictionary;
dictionarykeyType = GetBestAllowableTableType((dictionary.Keys as IEnumerable).AsQueryable().ElementType);
dictionaryKeys = new Object[dictionary.Keys.Count];
dictionary.Keys.CopyTo(dictionaryKeys, 0);
}
IEnumerable items = isDictionary ? (enumerable as IDictionary).Values : enumerable;
Type elementType = items.AsQueryable().ElementType;
DataSetTypeMap typeMap = GetDataSetTypeMap(elementType);
if (typeMap.Properties.Count == 0)
{
continue;
}
if (idx++ == 0)
{
// this is the first item
ds.DataSetName = items.AsQueryable().ElementType.Name;
}
// ensure that table names are unique
Int32 nameIdx = 2;
string tableName = elementType.Name;
do
{
if (tableNames.Contains(tableName))
{
tableName = string.Format("{0} ({1})", elementType.Name, nameIdx++);
continue;
}
tableNames.Add(tableName);
break;
} while (true);
// create the table and it's columns
DataTable table = ds.Tables.Add(tableName);
if (isDictionary)
{
table.Columns.Add("Key", dictionarykeyType);
}
foreach (DataSetTypeMapProperty typeProperty in typeMap.Properties)
{
table.Columns.Add(typeProperty.Property.Name, typeProperty.DataType);
}
// now fill the rows for this table
Int32 itemIdx = 0;
Int32 valueOffSet = isDictionary ? 1 : 0;
foreach (var item in items)
{
if (item != null)
{
Object[] values = new Object[table.Columns.Count];
if (isDictionary)
{
values[0] = dictionarykeyType == typeof(String) ? dictionaryKeys[itemIdx].ToString() : dictionaryKeys[itemIdx];
}
for (Int32 i = 0; i < typeMap.Properties.Count; i++)
{
values[i + valueOffSet] = typeMap.Properties[i].Property.GetValue(item, null);
}
table.Rows.Add(values);
}
itemIdx++;
}
}
return(ds);
}
catch (Exception)
{
ds.Dispose();
throw;
}
}
