| public Update ( Expression operand ) : UnaryExpression | ||
| operand | Expression | The |
| Результат | UnaryExpression | |
private Expression VisitUnaryExtracted(UnaryExpression node)
{
var visited = Visit(node.Operand);
var updated = node.Update(visited);
return(ValidateUnary(node, updated));
}
protected override ExpressionTree VisitUnary(UnaryExpression node)
{
CheckChildrenCount(1);
var o = ExtractChildExpression(0);
var expression = node.Update(o);
return(CreateExpressionTree(expression));
}
/// <summary>
/// Visits a unary expression that's not a <see cref="ExpressionType.Quote"/> using the specified
/// assignment behavior. If the node represents an assignment, the <see cref="UnaryExpression.Operand"/>
/// is visited using <see cref="VisitLval"/>.
/// </summary>
/// <param name="node">The unary expression to visit.</param>
/// <param name="isAssignment">Indicates if the node represents an assignment.</param>
/// <returns>The result of visiting the unary expression.</returns>
protected virtual Expression VisitUnaryNonQuote(UnaryExpression node, bool isAssignment)
{
if (isAssignment)
{
var operand = VisitLval(node.Operand);
return(node.Update(operand));
}
else
{
return(base.VisitUnaryNonQuote(node));
}
}
protected override Expression VisitUnary(UnaryExpression node)
{
if (node.NodeType == ExpressionType.ArrayLength) {
Expression expression = this.Visit(node.Operand);
//translate arraylength into normal member expression
return Expression.MakeMemberAccess(expression, expression.Type.GetRuntimeProperty("Length"));
} else if (node.NodeType == ExpressionType.Convert) {
return this.Visit(node.Operand);
} else {
return node.Update(this.Visit(node.Operand));
}
}
protected override Expression VisitUnary(UnaryExpression node)
{
switch (node.NodeType)
{
case ExpressionType.ArrayLength:
var expression = this.Visit(node.Operand);
//translate arraylength into normal member expression
return Expression.MakeMemberAccess(expression, expression.Type.GetRuntimeProperty("Length"));
case ExpressionType.Convert:
return this.Visit(node.Operand);
default:
return node.Update(this.Visit(node.Operand));
}
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
protected override Expression VisitUnary(UnaryExpression node)
{
var operand = Visit(node.Operand);
if (!IsOptimalExpansion)
{
return node;
}
if (node.NodeType == ExpressionType.Not)
{
IsOptimalExpansion = false;
}
return node.Update(operand);
}
/// <summary>
/// Visits the children of the <see cref="UnaryExpression"/>.
/// </summary>
/// <param name="node">The expression to visit.</param>
/// <returns>The modified expression, if it or any subexpression was modified;
/// otherwise, returns the original expression.</returns>
protected internal virtual Expression VisitUnary(UnaryExpression node)
{
return(ValidateUnary(node, node.Update(Visit(node.Operand))));
}
private UnaryExpression replaceUnaryNodeChild(UnaryExpression node, Expression oldChild, Expression newChild)
{
return node.Update(newChild);
}
