尝试更新C＃中的“货币”字段时出错

Question

I'm trying to update the invoice field "freightamount" from my C# code. I'm able to update other fields well like strings and Guid but for Money I get this error on creating or updating the invoice entity:

There was an error while trying to serialize parameter      
 http://schemas.microsoft.com/xrm/2011/Contracts/Services:entity. The InnerException 
 message was 'Type 'Microsoft.Xrm.Sdk.Money' with data contract name 
'Money:http://schemas.microsoft.com/xrm/2011/Contracts' is not expected. Consider using a 
DataContractResolver or add any types not known statically to the list of known types - 
for example, by using the KnownTypeAttribute attribute or by adding them to the list of 
 known types passed to DataContractSerializer.'.  Please see InnerException for more 
 details.

Here's a part of my code:

I use the reference to " Microsoft.Xrm.Sdk "

Then in code:

 invoice.Attributes.Add(new KeyValuePair<string, object>("freightamount",  new Microsoft.Xrm.Sdk.Money (row.amount)));

Where row.amount is a decimal value.

Answer 1

Have you tried adding Money as a KnownTypeAttribute for the Entity class by adding it to the web.config?

<system.runtime.serialization>
    <dataContractSerializer>
        <declaredTypes>
            <add type="Microsoft.Xrm.Sdk.Entity, Microsoft.Xrm.Sdk, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35">
                <knownType type = "Microsoft.Xrm.Sdk.Money, Microsoft.Xrm.Sdk, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>                 
             </add>
        </declaredTypes>
    </dataContractSerializer>
</system.runtime.serialization>