internal override Expression VisitConstant(ConstantExpression c)
{
string result;
if (c.Value == null)
{
_builder.Append(UriHelper.NULL);
return(c);
}
else if (!ClientConvert.TryKeyPrimitiveToString(c.Value, out result))
{
throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, SR.ALinqCouldNotConvert, c.Value));
}
Debug.Assert(result != null, "result != null");
// A Difference from WCF Data Services is that we will escape later when we execute the fully parsed query.
_builder.Append(result);
return(c);
}
internal static bool TryXmlPrimitiveToString(object value, out string result)
{
Debug.Assert(value != null, "value != null");
Type valueType = value.GetType();
valueType = Nullable.GetUnderlyingType(valueType) ?? valueType;
if (typeof(string) == valueType)
{
result = (string)value;
}
else if (typeof(bool) == valueType)
{
result = XmlConvert.ToString((bool)value);
}
else if (typeof(byte) == valueType)
{
result = XmlConvert.ToString((byte)value);
}
else if (typeof(DateTime) == valueType)
{
result = XmlConvert.ToString((DateTime)value, XmlDateTimeSerializationMode.RoundtripKind);
}
else if (typeof(decimal) == valueType)
{
result = XmlConvert.ToString((decimal)value);
}
else if (typeof(double) == valueType)
{
result = XmlConvert.ToString((double)value);
}
else if (typeof(Guid) == valueType)
{
result = value.ToString();
}
else if (typeof(short) == valueType)
{
result = XmlConvert.ToString((short)value);
}
else if (typeof(int) == valueType)
{
result = XmlConvert.ToString((int)value);
}
else if (typeof(long) == valueType)
{
result = XmlConvert.ToString((long)value);
}
else if (typeof(sbyte) == valueType)
{
result = XmlConvert.ToString((sbyte)value);
}
else if (typeof(float) == valueType)
{
result = XmlConvert.ToString((float)value);
}
else if (typeof(byte[]) == valueType)
{
byte[] byteArray = (byte[])value;
result = Convert.ToBase64String(byteArray);
}
else if (ClientConvert.IsBinaryValue(value))
{
return(ClientConvert.TryKeyBinaryToString(value, out result));
}
else if (typeof(System.Xml.Linq.XElement) == valueType)
{
result = ((System.Xml.Linq.XElement)value).ToString(System.Xml.Linq.SaveOptions.None);
}
else
{
result = null;
return(false);
}
Debug.Assert(result != null, "result != null");
return(true);
}
private static int IndexOfStorage(Type type)
{
int index = ClientConvert.IndexOfReference(ClientConvert.s_knownTypes, type);
return(index);
}