//{new App() {Id = p.Id}}
protected override Expression VisitMemberInit(MemberInitExpression node)
{
if (node.NewExpression != null)
{
this.VisitAllArguments(node.NewExpression);
}
if (_navDescriptorKeys.Count == 0)
{
_navDescriptorKeys.Add(node.Type.Name);
}
//todo #对 Bindings 进行排序，保证导航属性的赋值一定要最后面#
// 未实现，在书写表达式时人工保证 ##
for (int i = 0; i < node.Bindings.Count; i++)
{
MemberAssignment binding = node.Bindings[i] as MemberAssignment;
if (binding == null)
{
throw new XfwException("Only 'MemberAssignment' binding supported.");
}
Type pType = (node.Bindings[i].Member as System.Reflection.PropertyInfo).PropertyType;
bool visitNav = !TypeUtils.IsPrimitive(pType);
#region 一般属性
// 非导航属性
if (!visitNav)
{
base.VisitMemberBinding(node.Bindings[i]);
// 选择字段
string newName = ColumnExpressionVisitor.AddColumn(_columns, binding.Member.Name);
// 添加字段别名
_builder.AppendAs(newName);
_builder.Append(',');
_builder.AppendNewLine();
continue;
}
#endregion
#region 导航属性
int n = _navDescriptorKeys.Count;
string keyName = _navDescriptorKeys.Count > 0 ? _navDescriptorKeys[_navDescriptorKeys.Count - 1] : string.Empty;
keyName = !string.IsNullOrEmpty(keyName) ? keyName + "." + binding.Member.Name : binding.Member.Name;
ColumnNavDescriptor descriptor = new ColumnNavDescriptor(keyName, binding.Member);
if (!_navDescriptors.ContainsKey(keyName))
{
descriptor.Start = _columns.Count;
descriptor.Count = CountField(binding.Expression);
_navDescriptors.Add(keyName, descriptor);
_navDescriptorKeys.Add(keyName);
}
if (binding.Expression.NodeType == ExpressionType.MemberAccess)
{
this.VisitMember_Navigation(binding.Expression as MemberExpression);
}
else if (binding.Expression.NodeType == ExpressionType.New)
{
this.VisitAllArguments(binding.Expression as NewExpression);
}
else if (binding.Expression.NodeType == ExpressionType.MemberInit)
{
this.VisitMemberInit(binding.Expression as MemberInitExpression);
}
if (_navDescriptorKeys.Count != n)
{
_navDescriptorKeys.RemoveAt(_navDescriptorKeys.Count - 1);
}
#endregion
}
return(node);
}
// 导航属性
private static void ToModel_Navigation(object model, object[] values, CommandDefine_Select define, string typeName)
{
// CRM_SaleOrder.Client
Type pType = model.GetType();
TypeRuntimeInfo runtime = TypeRuntimeInfoCache.GetRuntimeInfo(pType);
if (string.IsNullOrEmpty(typeName))
{
typeName = pType.Name;
}
foreach (var kvp in runtime.NavWrappers)
{
string keyName = typeName + "." + kvp.Key;
ColumnNavDescriptor descriptor = null;
define.NavDescriptors.TryGetValue(keyName, out descriptor);
if (descriptor == null)
{
continue;
}
// 实例化这个导航属性并且给它赋值
var navWrapper = kvp.Value;
Type navType = navWrapper.DataType;
TypeRuntimeInfo navRuntime = TypeRuntimeInfoCache.GetRuntimeInfo(navType);
object navModel = navRuntime.ConstructInvoker.Invoke();
if (descriptor.Count > 0)
{
int index = -1;
foreach (var c_kvp in define.Columns)
{
index += 1;
if (index < descriptor.Start)
{
continue;
}
if (index > (descriptor.Start + descriptor.Count))
{
break;
}
object obj = values[index];
if (obj == DBNull.Value)
{
continue;
}
var wrapper = navRuntime.GetWrapper(c_kvp.Value.Name) as MemberAccessWrapper;
if (wrapper != null)
{
SetProperty(navModel, wrapper, obj);
}
}
}
SetProperty(model, navWrapper, navModel);
if (navRuntime.NavWrappers.Count > 0)
{
ToModel_Navigation(navModel, values, define, keyName);
}
}
}
