Databases
StackOverflow2013
Postsdbo
PODynamic vs Typed produces strange results
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PODynamic vs Typed produces strange results
    primarykey
    data
    text
    <p>I have SAP RPC OCX control that I'd like to use. In C# 4 following code works fine:</p> <pre><code>System.Type t = System.Type.GetTypeFromProgID("SAP.Functions", true); dynamic fc = System.Activator.CreateInstance(t, false); dynamic connection = fc.Connection; connection.System = ""; </code></pre> <p>Following code does NOT work (even though connection is NOT null)</p> <pre><code>System.Type t = System.Type.GetTypeFromProgID("SAP.Functions", true); dynamic fc = System.Activator.CreateInstance(t, false); var connection = fc.Connection as SAPLogonCtrl.Connection connection.System = ""; </code></pre> <p>Following error is thrown: "Attempted to read or write protected memory. This is often an indication that other memory is corrupt."</p> <p>The most bizarre fact is this though:</p> <pre><code>System.Type t = System.Type.GetTypeFromProgID("SAP.Functions", true); dynamic fc = System.Activator.CreateInstance(t, false); dynamic c1 = fc.Connection; var c2 = fc.Connection as SAPLogonCtrl.Connection; if (c1 == c2) c2.System = ""; </code></pre> <p>Last line is executed and throws the same exception!!! Replace c2 with c1 works as expected...</p> <p>I feel I am missing something trivial and yet I am at a complete loss... Please help?</p> <p>Additional info: Changing from:</p> <pre><code>dynamic fc = System.Activator.CreateInstance(t, false); </code></pre> <p>to:</p> <pre><code>var fc = System.Activator.CreateInstance(t, false) as SAPFunctionsOCX.SAPFunctions; </code></pre> <p>Makes no difference. c1 still works and c2 still does not.</p> <p>Additional info #2: Changing properties on FC itself also works in both cases.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USMatthew Murdoch
    1. USMichael Feinstein
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. PODynamic vs Typed produces strange results
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PODynamic vs Typed produces strange results
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PODynamic vs Typed produces strange results
      1. This table or related slice is empty.
      1. VTUpMod
    1. COPlease show us what the following return: `c1.GetType().ToString()` and `c2.GetType().ToString()`.
      singulars
      1. PODynamic vs Typed produces strange results
      1. USDaniel Hilgarth
    2. COBoth return System.__ComObject
      singulars
      1. PODynamic vs Typed produces strange results
      1. USMichael Feinstein
    3. COI'm taking a shot in the dark here, but maybe `fc.Connection` is actually an instance of a class inherited from `SAPLogonCtrl.Connection`. That is why your `as` is not returning null and why you are seeing different behavior. Which may be what Daniel was trying to get at by asking you the types.
      singulars
      1. PODynamic vs Typed produces strange results
      1. USGreg
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload