public static void CreateMemberInitExpression()
{
System.Linq.Expressions.NewExpression newAnimal =
System.Linq.Expressions.Expression.New(typeof(Animal));
System.Reflection.MemberInfo speciesMember =
typeof(Animal).GetMember("Species")[0];
System.Reflection.MemberInfo ageMember =
typeof(Animal).GetMember("Age")[0];
// Create a MemberBinding object for each member
// that you want to initialize.
System.Linq.Expressions.MemberBinding speciesMemberBinding =
System.Linq.Expressions.Expression.Bind(
speciesMember,
System.Linq.Expressions.Expression.Constant("horse"));
System.Linq.Expressions.MemberBinding ageMemberBinding =
System.Linq.Expressions.Expression.Bind(
ageMember,
System.Linq.Expressions.Expression.Constant(12));
// Create a MemberInitExpression that represents initializing
// two members of the 'Animal' class.
System.Linq.Expressions.MemberInitExpression memberInitExpression =
System.Linq.Expressions.Expression.MemberInit(
newAnimal,
speciesMemberBinding,
ageMemberBinding);
Console.WriteLine(memberInitExpression.ToString());
// This code produces the following output:
//
// new Animal() {Species = "horse", Age = 12}
}
protected override System.Linq.Expressions.MemberBinding VisitBinding(System.Linq.Expressions.MemberBinding binding)
{
if ((this.ExcuteType == DMSExcuteType.UPDATE ||
this.ExcuteType == DMSExcuteType.INSERT ||
this.ExcuteType == DMSExcuteType.INSERTIDENTITY ||
this.ExcuteType == DMSExcuteType.INSERT_SELECT ||
this.ExcuteType == DMSExcuteType.UPDATE_WHERE) && binding.BindingType == System.Linq.Expressions.MemberBindingType.Assignment)
{
string text = string.Empty;
MemberInfo memberInfo = binding.Member;
this._CurrentMemberInfo = memberInfo;
if (this.ExcuteType == DMSExcuteType.UPDATE_WHERE)
{
var lastTableKey = this.TableKeys.Where(q => q.AssemblyQualifiedName == memberInfo.DeclaringType.AssemblyQualifiedName).LastOrDefault();
if (lastTableKey != null)
{
text = lastTableKey.TableSpecialName;
if (this.SplitExpression.TableMapping.TokenFlag == true)
{
text = this.Provider.BuildColumnName(text);
}
this._strSql.Append(text);
this._strSql.Append(this.Provider.TableToken);
}
}
text = GetMemberInfoName(memberInfo.Name);
if (this.SplitExpression.TableMapping.TokenFlag == true)
{
text = this.Provider.BuildColumnName(text);
}
this._strSql.Append(text);
if (this.ExcuteType == DMSExcuteType.UPDATE || this.ExcuteType == DMSExcuteType.UPDATE_WHERE)
{
this._ParamSql.Append(text);
this._strSql.Append(DMSOperators.FormatBinaryOperator(System.Linq.Expressions.ExpressionType.Equal));
}
}
return(base.VisitBinding(binding));
}
