| static private PropertyDoesNotHaveAccessor ( object p0, string paramName ) : Exception | ||
| p0 | object | |
| paramName | string | |
| Результат | Exception | |
public static MemberExpression Property(Expression expression, PropertyInfo property)
{
ContractUtils.RequiresNotNull(property, "property");
MethodInfo mi = property.GetGetMethod(true) ?? property.GetSetMethod(true);
if (mi == null)
{
throw Error.PropertyDoesNotHaveAccessor(property);
}
if (mi.IsStatic)
{
ContractUtils.Requires(expression == null, "expression", Strings.OnlyStaticPropertiesHaveNullInstance);
}
else
{
ContractUtils.Requires(expression != null, "property", Strings.OnlyStaticPropertiesHaveNullInstance);
RequiresCanRead(expression, "expression");
if (!TypeUtils.IsValidInstanceType(property, expression.Type))
{
throw Error.PropertyNotDefinedForType(property, expression.Type);
}
}
return(MemberExpression.Make(expression, property));
}
// CTS places no restrictions on properties (see ECMA-335 8.11.3),
// so we validate that the property conforms to CLS rules here.
//
// TODO: Do we still need all of this now that we take PropertyInfo?
// Does reflection help us out at all? Expression.Property skips all of
// these checks, so either it needs more checks or we need less here.
private static void ValidateIndexedProperty(Expression instance, PropertyInfo property, ref ReadOnlyCollection <Expression> argList)
{
// If both getter and setter specified, all their parameter types
// should match, with exception of the last setter parameter which
// should match the type returned by the get method.
// Accessor parameters cannot be ByRef.
ContractUtils.RequiresNotNull(property, "property");
ContractUtils.Requires(!property.PropertyType.IsByRef, "property", Strings.PropertyCannotHaveRefType);
ContractUtils.Requires(property.PropertyType != typeof(void), "property", Strings.PropertyTypeCannotBeVoid);
ParameterInfo[] getParameters = null;
MethodInfo getter = property.GetGetMethod(true);
if (getter != null)
{
getParameters = getter.GetParametersCached();
ValidateAccessor(instance, getter, getParameters, ref argList);
}
MethodInfo setter = property.GetSetMethod(true);
if (setter != null)
{
ParameterInfo[] setParameters = setter.GetParametersCached();
ContractUtils.Requires(setParameters.Length > 0, "property", Strings.SetterHasNoParams);
// valueType is the type of the value passed to the setter (last parameter)
Type valueType = setParameters[setParameters.Length - 1].ParameterType;
ContractUtils.Requires(!valueType.IsByRef, "property", Strings.PropertyCannotHaveRefType);
ContractUtils.Requires(setter.ReturnType == typeof(void), "property", Strings.SetterMustBeVoid);
ContractUtils.Requires(property.PropertyType == valueType, "property", Strings.PropertyTyepMustMatchSetter);
if (getter != null)
{
ContractUtils.Requires(!(getter.IsStatic ^ setter.IsStatic), "property", Strings.BothAccessorsMustBeStatic);
ContractUtils.Requires(getParameters.Length == setParameters.Length - 1, "property", Strings.IndexesOfSetGetMustMatch);
for (int i = 0; i < getParameters.Length; i++)
{
ContractUtils.Requires(getParameters[i].ParameterType == setParameters[i].ParameterType, "property", Strings.IndexesOfSetGetMustMatch);
}
}
else
{
ValidateAccessor(instance, setter, setParameters.RemoveLast(), ref argList);
}
}
if (getter == null && setter == null)
{
throw Error.PropertyDoesNotHaveAccessor(property);
}
}
public static MemberExpression Property(Expression expression, PropertyInfo property)
{
ContractUtils.RequiresNotNull(property, nameof(property));
var mi = property.GetGetMethod(nonPublic: true);
if (mi == null)
{
mi = property.GetSetMethod(nonPublic: true);
if (mi == null)
{
throw Error.PropertyDoesNotHaveAccessor(property, nameof(property));
}
if (mi.GetParameters().Length != 1)
{
throw Error.IncorrectNumberOfMethodCallArguments(mi, nameof(property));
}
}
else if (mi.GetParameters().Length != 0)
{
throw Error.IncorrectNumberOfMethodCallArguments(mi, nameof(property));
}
if (mi.IsStatic)
{
if (expression != null)
{
throw Error.OnlyStaticPropertiesHaveNullInstance(nameof(expression));
}
}
else
{
if (expression == null)
{
throw Error.OnlyStaticPropertiesHaveNullInstance(nameof(property));
}
ExpressionUtils.RequiresCanRead(expression, nameof(expression));
if (!TypeUtils.IsValidInstanceType(property, expression.Type))
{
throw Error.PropertyNotDefinedForType(property, expression.Type, nameof(property));
}
}
ValidateMethodInfo(mi, nameof(property));
return(MemberExpression.Make(expression, property));
}
public static MemberExpression Property(Expression expression, PropertyInfo property)
{
ContractUtils.RequiresNotNull(property, "property");
MethodInfo mi = property.GetGetMethod(true);
if (mi == null)
{
mi = property.GetSetMethod(true);
if (mi == null)
{
throw Error.PropertyDoesNotHaveAccessor(property);
}
else if (mi.GetParametersCached().Length != 1)
{
throw Error.IncorrectNumberOfMethodCallArguments(mi);
}
}
else if (mi.GetParametersCached().Length != 0)
{
throw Error.IncorrectNumberOfMethodCallArguments(mi);
}
if (mi.IsStatic)
{
if (expression != null)
{
throw new ArgumentException(Strings.OnlyStaticPropertiesHaveNullInstance, "expression");
}
}
else
{
if (expression == null)
{
throw new ArgumentException(Strings.OnlyStaticPropertiesHaveNullInstance, "property");
}
RequiresCanRead(expression, "expression");
if (!TypeUtils.IsValidInstanceType(property, expression.Type))
{
throw Error.PropertyNotDefinedForType(property, expression.Type);
}
}
return(MemberExpression.Make(expression, property));
}
// CTS places no restrictions on properties (see ECMA-335 8.11.3),
// so we validate that the property conforms to CLS rules here.
//
// Does reflection help us out at all? Expression.Property skips all of
// these checks, so either it needs more checks or we need less here.
private static void ValidateIndexedProperty(Expression instance, PropertyInfo property, ref ReadOnlyCollection <Expression> argList)
{
// If both getter and setter specified, all their parameter types
// should match, with exception of the last setter parameter which
// should match the type returned by the get method.
// Accessor parameters cannot be ByRef.
ContractUtils.RequiresNotNull(property, "property");
if (property.PropertyType.IsByRef)
{
throw Error.PropertyCannotHaveRefType();
}
if (property.PropertyType == typeof(void))
{
throw Error.PropertyTypeCannotBeVoid();
}
ParameterInfo[] getParameters = null;
var getter = property.GetGetMethod(true);
if (getter != null)
{
getParameters = getter.GetParameters();
ValidateAccessor(instance, getter, getParameters, ref argList);
}
var setter = property.GetSetMethod(true);
if (setter != null)
{
var setParameters = setter.GetParameters();
if (setParameters.Length == 0)
{
throw Error.SetterHasNoParams();
}
// valueType is the type of the value passed to the setter (last parameter)
var valueType = setParameters[setParameters.Length - 1].ParameterType;
if (valueType.IsByRef)
{
throw Error.PropertyCannotHaveRefType();
}
if (setter.ReturnType != typeof(void))
{
throw Error.SetterMustBeVoid();
}
if (property.PropertyType != valueType)
{
throw Error.PropertyTyepMustMatchSetter();
}
if (getter != null)
{
if (getter.IsStatic ^ setter.IsStatic)
{
throw Error.BothAccessorsMustBeStatic();
}
if (getParameters.Length != setParameters.Length - 1)
{
throw Error.IndexesOfSetGetMustMatch();
}
for (var i = 0; i < getParameters.Length; i++)
{
if (getParameters[i].ParameterType != setParameters[i].ParameterType)
{
throw Error.IndexesOfSetGetMustMatch();
}
}
}
else
{
ValidateAccessor(instance, setter, setParameters.RemoveLast(), ref argList);
}
}
if (getter == null && setter == null)
{
throw Error.PropertyDoesNotHaveAccessor(property);
}
}
// CTS places no restrictions on properties (see ECMA-335 8.11.3),
// so we validate that the property conforms to CLS rules here.
//
// Does reflection help us out at all? Expression.Property skips all of
// these checks, so either it needs more checks or we need less here.
private static void ValidateIndexedProperty(Expression?instance, PropertyInfo indexer, string paramName, ref ReadOnlyCollection <Expression> argList)
{
// If both getter and setter specified, all their parameter types
// should match, with exception of the last setter parameter which
// should match the type returned by the get method.
// Accessor parameters cannot be ByRef.
ContractUtils.RequiresNotNull(indexer, paramName);
if (indexer.PropertyType.IsByRef)
{
throw Error.PropertyCannotHaveRefType(paramName);
}
if (indexer.PropertyType == typeof(void))
{
throw Error.PropertyTypeCannotBeVoid(paramName);
}
ParameterInfo[]? getParameters = null;
MethodInfo?getter = indexer.GetGetMethod(nonPublic: true);
if (getter != null)
{
if (getter.ReturnType != indexer.PropertyType)
{
throw Error.PropertyTypeMustMatchGetter(paramName);
}
getParameters = getter.GetParametersCached();
ValidateAccessor(instance, getter, getParameters, ref argList, paramName);
}
MethodInfo?setter = indexer.GetSetMethod(nonPublic: true);
if (setter != null)
{
ParameterInfo[] setParameters = setter.GetParametersCached();
if (setParameters.Length == 0)
{
throw Error.SetterHasNoParams(paramName);
}
// valueType is the type of the value passed to the setter (last parameter)
Type valueType = setParameters[setParameters.Length - 1].ParameterType;
if (valueType.IsByRef)
{
throw Error.PropertyCannotHaveRefType(paramName);
}
if (setter.ReturnType != typeof(void))
{
throw Error.SetterMustBeVoid(paramName);
}
if (indexer.PropertyType != valueType)
{
throw Error.PropertyTypeMustMatchSetter(paramName);
}
if (getter != null)
{
if (getter.IsStatic ^ setter.IsStatic)
{
throw Error.BothAccessorsMustBeStatic(paramName);
}
if (getParameters !.Length != setParameters.Length - 1)
{
throw Error.IndexesOfSetGetMustMatch(paramName);
}
for (int i = 0; i < getParameters.Length; i++)
{
if (getParameters[i].ParameterType != setParameters[i].ParameterType)
{
throw Error.IndexesOfSetGetMustMatch(paramName);
}
}
}
else
{
ValidateAccessor(instance, setter, setParameters.RemoveLast(), ref argList, paramName);
}
}
else if (getter == null)
{
throw Error.PropertyDoesNotHaveAccessor(indexer, paramName);
}
}
/// <summary>
/// Creates a <see cref="MemberInitializer"/> binding the specified value to the given member.
/// </summary>
/// <param name="member">The <see cref="MemberInfo"/> for the member which is being assigned to.</param>
/// <param name="expression">The value to be assigned to <paramref name="member"/>.</param>
/// <returns>The created <see cref="MemberInitializer"/>.</returns>
public static MemberInitializer MemberInitializer(MemberInfo member, Expression expression)
{
RequiresNotNull(member, nameof(member));
//
// NB: System.Linq.Expressions fails to checks for static members in ValidateSettableFieldOrPropertyMember.
//
// class Foo { public static int Bar { get; set; } }
//
// Expression.Lambda<Func<Foo>>(
// Expression.MemberInit(
// Expression.New(typeof(Foo)),
// Expression.Bind(typeof(Foo).GetProperty("Bar"), Expression.Constant(1))
// )
// ).Compile()
//
// throws 'System.Security.VerificationException: Operation could destabilize the runtime.'
//
// We add this check here.
//
Type memberType;
switch (member)
{
case FieldInfo f:
memberType = f.FieldType;
if (f.IsStatic)
{
throw Error.MemberInitializerMemberMustNotBeStatic(member.Name);
}
break;
case PropertyInfo p:
memberType = p.PropertyType;
var accessor = p.GetGetMethod(nonPublic: true) ?? p.GetSetMethod(nonPublic: true);
if (accessor == null)
{
throw LinqError.PropertyDoesNotHaveAccessor(p);
}
if (accessor.IsStatic)
{
throw Error.MemberInitializerMemberMustNotBeStatic(member.Name);
}
if (p.GetIndexParameters().Length > 0)
{
throw Error.MemberInitializerMemberMustNotBeIndexer(member.Name);
}
break;
default:
throw LinqError.ArgumentMustBeFieldInfoOrPropertInfo();
}
RequiresCanRead(expression, nameof(expression));
//
// NB: We don't check here for an accessible setter in order to support anonymous types where
// the getter is specified instead.
//
if (!memberType.IsAssignableFrom(expression.Type))
{
throw LinqError.ArgumentTypesMustMatch();
}
if (member.DeclaringType == null)
{
throw Error.NotAMemberOfAnyType(member);
}
ValidateType(member.DeclaringType);
return(new MemberInitializer(member, expression));
}
/// <summary>
/// Creates an expression representing an indexer access operation.
/// </summary>
/// <param name="object">The object to access.</param>
/// <param name="argument">The argument that will be used to index or slice the object.</param>
/// <param name="lengthOrCount">The property used to retrieve the element count of the object getting accessed.</param>
/// <param name="indexOrSlice">The member used to index or slice the object.</param>
/// <returns>A new <see cref="IndexerAccessCSharpExpression"/> instance representing the array access operation.</returns>
public static IndexerAccessCSharpExpression IndexerAccess(Expression @object, Expression argument, PropertyInfo lengthOrCount, MemberInfo indexOrSlice)
{
RequiresCanRead(@object, nameof(@object));
//
// The argument can be of type Index or Range. We'll check indexOrSlice accordingly below.
//
RequiresCanRead(argument, nameof(argument));
if (argument.Type != typeof(Index) && argument.Type != typeof(Range))
{
throw Error.InvalidIndexerAccessArgumentType(argument.Type);
}
//
// A type is Countable if it has a property named Length or Count with an accessible getter and a return type of int.
//
lengthOrCount ??= FindCountProperty("Length") ?? FindCountProperty("Count");
PropertyInfo FindCountProperty(string name) => @object.Type.GetProperty(name, BindingFlags.Public | BindingFlags.Instance, binder: null, typeof(int), Type.EmptyTypes, modifiers: null);
ContractUtils.RequiresNotNull(lengthOrCount, nameof(lengthOrCount));
var lengthOrCountGetMethod = lengthOrCount.GetGetMethod(nonPublic: true); // NB: System.Linq.Expressions allows non-public properties.
if (lengthOrCountGetMethod == null)
{
throw LinqError.PropertyDoesNotHaveAccessor(lengthOrCount);
}
if (lengthOrCountGetMethod.IsStatic)
{
throw Error.AccessorCannotBeStatic(lengthOrCountGetMethod);
}
if (lengthOrCountGetMethod.GetParametersCached().Length != 0)
{
throw LinqError.IncorrectNumberOfMethodCallArguments(lengthOrCountGetMethod);
}
if (!TypeUtils.IsValidInstanceType(lengthOrCount, @object.Type))
{
throw LinqError.PropertyNotDefinedForType(lengthOrCount, @object.Type);
}
if (lengthOrCount.PropertyType != typeof(int))
{
throw Error.InvalidLengthOrCountPropertyType(lengthOrCount);
}
ValidateMethodInfo(lengthOrCountGetMethod);
if (argument.Type == typeof(Index))
{
//
// The type has an accessible instance indexer which takes a single int as the argument.
//
indexOrSlice ??= FindIndexer();
PropertyInfo FindIndexer()
{
var indexers = (from p in @object.Type.GetProperties(BindingFlags.Public | BindingFlags.Instance)
let i = p.GetIndexParameters()
where i.Length == 1 && i[0].ParameterType == typeof(int)
select p)
.ToArray();
return(indexers.Length == 1 ? indexers[0] : null);
}
ContractUtils.RequiresNotNull(indexOrSlice, nameof(indexOrSlice));
var index = indexOrSlice as PropertyInfo ?? GetProperty(indexOrSlice as MethodInfo ?? throw Error.InvalidIndexMember(indexOrSlice));
indexOrSlice = index; // NB: Store the property rather than a method.
var indexAccessor = index.GetGetMethod(nonPublic: true); // NB: System.Linq.Expressions allows non-public properties.
if (indexAccessor == null)
{
indexAccessor = index.GetSetMethod(nonPublic: true) ?? throw LinqError.PropertyDoesNotHaveAccessor(indexOrSlice);
if (indexAccessor.GetParametersCached().Length != 2)
{
throw LinqError.IncorrectNumberOfMethodCallArguments(indexAccessor);
}
}
else if (indexAccessor.GetParametersCached().Length != 1)
{
throw LinqError.IncorrectNumberOfMethodCallArguments(indexAccessor);
}
if (indexAccessor.IsStatic)
{
throw Error.AccessorCannotBeStatic(indexAccessor);
}
if (!TypeUtils.IsValidInstanceType(indexAccessor, @object.Type))
{
throw LinqError.PropertyNotDefinedForType(indexAccessor, @object.Type);
}
if (indexAccessor.GetParametersCached()[0].ParameterType != typeof(int))
{
throw Error.InvalidIndexerParameterType(indexOrSlice);
}
ValidateMethodInfo(indexAccessor);
}
else
{
//
// The type has an accessible member named Slice which has two parameters of type int.
//
Debug.Assert(argument.Type == typeof(Range));
indexOrSlice ??= FindSliceMethod();
MethodInfo FindSliceMethod() => @object.Type.GetMethod(@object.Type == typeof(string) ? "Substring" : "Slice", BindingFlags.Public | BindingFlags.Instance, binder: null, new[] { typeof(int), typeof(int) }, modifiers: null);
ContractUtils.RequiresNotNull(indexOrSlice, nameof(indexOrSlice));
var slice = indexOrSlice as MethodInfo ?? throw Error.InvalidSliceMember(indexOrSlice);
ValidateMethodInfo(slice);
if (slice.IsStatic)
{
throw Error.SliceMethodMustNotBeStatic(slice);
}
ValidateCallInstanceType(@object.Type, slice);
var sliceParams = slice.GetParametersCached();
if (sliceParams.Length != 2 || sliceParams[0].ParameterType != typeof(int) || sliceParams[1].ParameterType != typeof(int))
{
throw Error.InvalidSliceParameters(slice);
}
}
return(new IndexerAccessCSharpExpression(@object, argument, lengthOrCount, indexOrSlice));
}
