如何在 MSCRM 中将查找值设置为空白或 null？
在 CRM 中设置查找值时，如果您不想更改任何内容，或者想将其设置为新值，则一切正常。但是，当您想要取消当前值时，具体方法尚不清楚。
例如，
house.new_associatepastorid = new HLCImport.CrmSdk.Lookup();
house.new_associatepastorid.type = EntityName.contact.ToString();
house.new_associatepastorid.value = Guid.Empty;
不起作用。
When setting a Lookup value in CRM everything works fine if you don't want to change anything, or if you want to set it to a new value. However, when you want to UNSET the current value, the way to do so is unclear.
For example,
house.new_associatepastorid = new HLCImport.CrmSdk.Lookup();
house.new_associatepastorid.type = EntityName.contact.ToString();
house.new_associatepastorid.value = Guid.Empty;
Does not work.
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设置 IsNull 和 IsNullSpecified 属性绝对没问题。对于更简单的代码，所有标准类型都有一个名为 Null 的静态成员。因此在这种情况下您可以使用 Lookup.Null。
Setting the IsNull and IsNullSpecified properties is absolutely fine. For simpler code, all of the standard types has a static member named Null. So in this case you could have used Lookup.Null.
我在SDK中找到了答案。您必须设置 isnull value = true，并设置 isnullspecified = true。您还不需要设置类型或值字段。所以代码是：
I found the answer in the SDK. You have to set the isnull value = true, as well as set the isnullspecified = true. You also need to not set the type or the value fields. So the code would be: