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Editorial Team
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Asked: 2026-05-25T20:09:17+00:00

I have a unit test that sends a moderately large object to a WCF

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I have a unit test that sends a moderately large object to a WCF service. If I pass null for that parameter, everything works fine. When I send a populated object, I get an HTTP 400 response.

WCF tracing shows this error:

The maximum message size quota for incoming messages (65536) has been
exceeded.

However, I have cranked up the size configuration parameters in app.config for the unit test project as follows:

<basicHttpBinding>
    <binding name="BasicHttpBinding_IMyAppService" closeTimeout="00:01:00"
        openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
        allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
        maxBufferSize="200000000" maxBufferPoolSize="200000000" maxReceivedMessageSize="200000000"
        messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
        useDefaultWebProxy="true">
      <readerQuotas maxDepth="32" maxArrayLength="200000000" maxStringContentLength="200000000"/>
        <security mode="None">
            <transport clientCredentialType="None" proxyCredentialType="None"
                realm="" />
            <message clientCredentialType="UserName" algorithmSuite="Default" />
        </security>
    </binding>
</basicHttpBinding>

What am I missing in my configuration to raise the allowed message size above the 65536 seen in the error message?

UPDATE:

The web.config file for the web service host also sets the maxReceivedMessageSize to a large value (I think):

<binding name="basicHttpBindingConfig" maxReceivedMessageSize="20000000" maxBufferSize="20000000" maxBufferPoolSize="20000000">
  <readerQuotas maxDepth="32" maxArrayLength="200000000" maxStringContentLength="200000000"/>
  <security mode="TransportCredentialOnly">
    <transport clientCredentialType="Ntlm"/>
  </security>
</binding>
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1 Answer

  1. Editorial Team

    If I understand your question correctly, you increased the size for ‘maxReceivedMessageSize’ in the unit test’s app.config. Actually you should make this change in the app.config/web.config of the web service which you are calling from your unit test code. If you host your web service in IIS, then it will be web.config. If you host it in windows service, then you need to make the change in the app.config (which gets moved to your .exe.config file in your bin folder.

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