实体框架+ PLS-00306：参数的数量或类型错误

Question

成为EF＆amp; amp;的初学者Oracle组合，我对以下内容感到困惑。

我有一个PLSQL程序：

CREATE OR REPLACE PROCEDURE "CountEmployee"("pDepartmentId" NUMBER, "pCount" OUT NUMBER)
AS  BEGIN
  SELECT COUNT(*) INTO "pCount" FROM "Employee" 
          WHERE "Employee"."DepartmentId" = "pDepartmentId";
END;

我尝试从C＃访问的人。来自上下文的方法看起来非常好，几乎与EF＆amp; SQLServer案例（除了数字 - ＆gt;十进制vs int - ＆gt; int转换）

public virtual int CountEmployee(Nullable<decimal> pDepartmentId, ObjectParameter pCount) {
  var pDepartmentIdParameter = pDepartmentId.HasValue ?
  new ObjectParameter("pDepartmentId", pDepartmentId) :
  new ObjectParameter("pDepartmentId", typeof(decimal));    
  return ((IObjectContextAdapter)this).
    ObjectContext.ExecuteFunction("CountEmployee", pDepartmentIdParameter, pCount);
}

但是，请致电CountEmployee

Department dep = ctx.Departments.Where(d => d.Name == "HR").First();
var objParam = new ObjectParameter("pCount", typeof(decimal));
ctx.CountEmployee(dep.Id, objParam);
Debug.Assert((decimal) objParam.Value > 0)

以“错误的数量或类型的参数”来惨败。

非常感谢任何指导。