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SqlMapper.DapperRowMetaObject.cs
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99 lines (85 loc) · 4.18 KB
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using System;
using System.Collections.Generic;
using System.Reflection;
namespace Dapper
{
public static partial class SqlMapper
{
private sealed partial class DapperRow : System.Dynamic.IDynamicMetaObjectProvider
{
System.Dynamic.DynamicMetaObject System.Dynamic.IDynamicMetaObjectProvider.GetMetaObject(
System.Linq.Expressions.Expression parameter)
{
return new DapperRowMetaObject(parameter, System.Dynamic.BindingRestrictions.Empty, this);
}
}
private sealed class DapperRowMetaObject : System.Dynamic.DynamicMetaObject
{
private static readonly MethodInfo getValueMethod = typeof(IDictionary<string, object>).GetProperty("Item")!.GetGetMethod()!;
private static readonly MethodInfo setValueMethod = typeof(DapperRow).GetMethod("SetValue", new Type[] { typeof(string), typeof(object) })!;
public DapperRowMetaObject(
System.Linq.Expressions.Expression expression,
System.Dynamic.BindingRestrictions restrictions
)
: base(expression, restrictions)
{
}
public DapperRowMetaObject(
System.Linq.Expressions.Expression expression,
System.Dynamic.BindingRestrictions restrictions,
object value
)
: base(expression, restrictions, value)
{
}
private System.Dynamic.DynamicMetaObject CallMethod(
MethodInfo method,
System.Linq.Expressions.Expression[] parameters
)
{
var callMethod = new System.Dynamic.DynamicMetaObject(
System.Linq.Expressions.Expression.Call(
System.Linq.Expressions.Expression.Convert(Expression, LimitType),
method,
parameters),
System.Dynamic.BindingRestrictions.GetTypeRestriction(Expression, LimitType)
);
return callMethod;
}
public override System.Dynamic.DynamicMetaObject BindGetMember(System.Dynamic.GetMemberBinder binder)
{
var parameters = new System.Linq.Expressions.Expression[]
{
System.Linq.Expressions.Expression.Constant(binder.Name)
};
var callMethod = CallMethod(getValueMethod, parameters);
return callMethod;
}
// Needed for Visual basic dynamic support
public override System.Dynamic.DynamicMetaObject BindInvokeMember(System.Dynamic.InvokeMemberBinder binder, System.Dynamic.DynamicMetaObject[] args)
{
var parameters = new System.Linq.Expressions.Expression[]
{
System.Linq.Expressions.Expression.Constant(binder.Name)
};
var callMethod = CallMethod(getValueMethod, parameters);
return callMethod;
}
public override System.Dynamic.DynamicMetaObject BindSetMember(System.Dynamic.SetMemberBinder binder, System.Dynamic.DynamicMetaObject value)
{
var parameters = new System.Linq.Expressions.Expression[]
{
System.Linq.Expressions.Expression.Constant(binder.Name),
System.Linq.Expressions.Expression.Convert(value.Expression, typeof(object)),
};
var callMethod = CallMethod(setValueMethod, parameters);
return callMethod;
}
public override IEnumerable<string> GetDynamicMemberNames()
{
if(HasValue && Value is IDictionary<string, object> lookup) return lookup.Keys;
return Array.Empty<string>();
}
}
}
}