public object GetList(ObjectWithID obj, string propertyName)
{
var objType = obj.GetType();
var property = objType.GetProperty(propertyName);
var propertyType = property.PropertyType;
var relatedType = propertyType.GenericTypeArguments[0];
foreach (var relatedProperty in relatedType.GetProperties())
{
var relatedPropertyType = relatedProperty.PropertyType;
if (objType == relatedPropertyType || objType.IsSubclassOf(relatedPropertyType))
{
var idList = new List <uint>();
Command.CommandText = $"SELECT ID FROM {relatedType.Name} WHERE {relatedProperty.Name} = {obj.ID}";
using (var reader = Command.ExecuteReader())
while (reader.Read())
{
idList.Add((uint)reader[0]);
}
var result = propertyType.GetConstructor(Type.EmptyTypes).Invoke(null);
var addFunc = propertyType.GetMethod("Add");
foreach (var id in idList)
{
var data = CreateObject(id, relatedType);
addFunc.Invoke(result, new object[] { data });
}
return(result);
}
}
return(null);
}
public void SetValue(ObjectWithID obj, string propertyName, object value)
{
var property = obj.GetType().GetProperty(propertyName);
var declaringType = property.DeclaringType;
var propertyType = property.PropertyType;
Command.CommandText = $"UPDATE {declaringType.Name} SET {property.Name} = @Value WHERE ID = {obj.ID}";
Command.Parameters.Clear();
// ObjectWithID子类
if (value is ObjectWithID data)
{
Command.Parameters.Add("@Value", MySqlDbType.UInt32);
Command.Parameters["@Value"].Value = data.ID;
}
// Nullable<Enum>
else if (propertyType.IsGenericType && propertyType.GetGenericTypeDefinition() == typeof(Nullable <>) && propertyType.GenericTypeArguments[0].IsEnum)
{
Command.Parameters.Add("@Value", MySqlDbType.Text);
Command.Parameters["@Value"].Value = value.ToString();
}
// 一般类型
else
{
Command.Parameters.Add("@Value", _TypeToDbType[property.PropertyType]);
Command.Parameters["@Value"].Value = value;
}
Command.ExecuteNonQuery();
}
public ObjectWithID CreateObject(uint id, Type type)
{
var baseType = type;
while (baseType.BaseType != typeof(ObjectWithID))
{
baseType = baseType.BaseType;
}
Command.CommandText = $"SELECT Type FROM {baseType.Name} WHERE ID = {id}";
using (var reader = Command.ExecuteReader())
{
reader.Read();
var guid = new Guid((byte[])reader[0]);
return(ObjectWithID.GetByID(id, guid));
}
}
public object GetValue(ObjectWithID obj, string propertyName)
{
var property = obj.GetType().GetProperty(propertyName);
var declaringType = property.DeclaringType;
var propertyType = property.PropertyType;
// ObjectWithID子类
if (propertyType.IsSubclassOf(typeof(ObjectWithID)))
{
uint id;
Command.CommandText = $"SELECT {propertyName} FROM {declaringType.Name} WHERE ID = {obj.ID}";
using (var reader = Command.ExecuteReader())
{
reader.Read();
id = (uint)reader[0];
}
return(CreateObject(id, propertyType));
}
// Nullable<Enum>
if (propertyType.IsGenericType && propertyType.GetGenericTypeDefinition() == typeof(Nullable <>) && propertyType.GenericTypeArguments[0].IsEnum)
{
Command.CommandText = $"SELECT {propertyName} FROM {declaringType.Name} WHERE ID = {obj.ID}";
using (var reader = Command.ExecuteReader())
{
reader.Read();
return(Enum.Parse(propertyType.GenericTypeArguments[0], (string)reader[0]));
}
}
// 一般类型
Command.CommandText = $"SELECT {propertyName} FROM {declaringType.Name} WHERE ID = {obj.ID}";
using (var reader = Command.ExecuteReader())
{
reader.Read();
return(reader[0]);
}
}
