/// <summary>
/// Process method calls and translate them into OData.
/// </summary>
/// <param name="expression">
/// The expression to visit.
/// </param>
/// <returns>
/// The visited expression.
/// </returns>
private Expression VisitMethodCall(MethodCallExpression expression)
{
// Look for either an instance or static method
string methodName = null;
MemberInfoKey methodInfoKey = new MemberInfoKey(expression.Method);
if (InstanceMethods.TryGetValue(methodInfoKey, out methodName))
{
this.VisitODataMethodCall(expression, methodName, false);
}
else if (StaticMethods.TryGetValue(methodInfoKey, out methodName))
{
this.VisitODataMethodCall(expression, methodName, true);
}
else if (expression.Method.GetRuntimeBaseDefinition().Equals(toStringMethod))
{
// handle the ToString method here
// toString will only occur on expression that rely on a parameter,
// because otherwise the partial evaluator would have already evaluated it
// we get the base definition to detect overrides of ToString, which are pretty common
this.Visit(expression.Object);
}
else
{
this.VisitCustomMethodCall(expression);
}
return(expression);
}
/// <summary>
/// Process member references.
/// </summary>
/// <param name="expression">
/// The expression to visit.
/// </param>
/// <returns>
/// The visited expression.
/// </returns>
private Expression VisitMemberAccess(MemberExpression expression)
{
// Lookup the Mobile Services name of the member and use that
string memberName = GetTableMemberName(expression, this.contractResolver);
if (memberName != null)
{
this.filter.Append(memberName);
return(expression);
}
// Check if this member is actually a function that looks like a
// property (like string.Length, etc.)
string methodName = null;
MemberInfoKey memberInfoKey = new MemberInfoKey(expression.Member);
if (InstanceProperties.TryGetValue(memberInfoKey, out methodName))
{
this.filter.Append(methodName);
this.filter.Append("(");
this.Visit(expression.Expression);
this.filter.Append(")");
return(expression);
}
// Otherwise we can't process the member.
throw new NotSupportedException(
string.Format(
CultureInfo.InvariantCulture,
Resources.FilterBuildingExpressionVisitor_MemberUnsupported,
expression != null && expression.Member != null ? expression.Member.Name : null,
expression != null ? expression.ToString() : null));
}