generics help needed
generics help needed
(OP)
Hi all,
I am trying to use some code found on cp. The one with the tick :)
http://stackoverflow.com/questions/793714/how-can-...
This db mapper works but not with nullable types. The method below just loops through datatablerow and fills a class
i am trying to call with this method but how do I pass the T when I call ?
I want to convert the above method so it will use method below to call setvalue method?
I am trying to use some code found on cp. The one with the tick :)
http://stackoverflow.com/questions/793714/how-can-...
This db mapper works but not with nullable types. The method below just loops through datatablerow and fills a class
i am trying to call with this method but how do I pass the T when I call ?
CODE
public static T DataTableToObject<T>( DataTable dt, int row) where T : new()
{
//string temp = "assignment";
//string temp1 = temp.Replace("a", "A");
//List<string> propNames = new List<string>();
PropertyInfo[] pi = typeof(T).GetProperties();
T objectName = new T();
int index = -1;
for (int i = 0; i < dt.Columns.Count; i++)
{
string colName = dt.Columns[i].ColumnName;
index = GetNamedPropertyIndex(colName, pi);
if (index != -1)
{
// this is a reference to the class property
// so what we do to this will be done to the class
PropertyInfo classProperty = pi[index];
if (colName.Equals(classProperty.Name, StringComparison.InvariantCultureIgnoreCase))
{
object cellValue = dt.Rows[row][colName];
Type cellType = dt.Rows[row][colName].GetType();
try
{
if (cellValue != DBNull.Value)
{
if (cellValue == DBNull.Value && classProperty.PropertyType.Name == "Int32")
cellValue = -1;
else if (cellValue == DBNull.Value && classProperty.PropertyType.Name == "Boolean")
cellValue = false;
if (cellValue == DBNull.Value && classProperty.PropertyType.Name == "DateTime")
cellValue = System.DateTime.MinValue;
if (cellType.ToString() == "System.Guid")
cellValue = cellValue.ToString();
else if (cellType.ToString() == "System.String")
cellValue = @cellValue.ToString();
else
cellValue = Convert.ChangeType(cellValue, classProperty.PropertyType);
classProperty.SetValue(objectName, cellValue, null);
}
}
catch (Exception ex)
{
throw new Exception("Error in Mapper converting the DT row to an object " +
objectName.ToString() + "on property " + classProperty.Name, ex);
}
}
}
}
return objectName; I want to convert the above method so it will use method below to call setvalue method?
CODE
public static T1 To<T1>(object obj)
where T1 : class
{
Type t = typeof(T1);
Type u = Nullable.GetUnderlyingType(t);
if (u != null)
{
if (obj == null)
return default(T1);
return (T1)Convert.ChangeType(obj, u);
}
else
{
return (T1)Convert.ChangeType(obj, t);
}
} Age is a consequence of experience
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RE: generics help needed
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