/// <summary>
/// 判断字段模型是否是主键
/// </summary>
/// <param name="field"></param>
/// <returns>如果该字段模型是主键则返回主键索引信息,否则返回null</returns>
public static IDataModelFieldIndex IsPrimaryKey(this IDataFieldModel field)
{
return(DataModelHelper.GetExtendProperty_PrimaryKey(field.InnerExtend));
}
