非常感谢leppie:目前我得到了
Expression<Func<vwMailMerge,bool>> whereClause= null;
List<vwMailMerge> mailMergeItems = null;
int personType = mailMergeSettings.PersonType.ToInteger();
if (personType > 0)
{
whereClause = this.MailMergeWhereClause(whereClause, f => f.MemberTypeId == personType);
}
if (mailMergeSettings.PersonIds != null)
{
var personIds = mailMergeSettings.PersonIds.ToGuidArray();
if (personIds != null && personIds.Length > 0)
{
var personList = personIds.ToList();
whereClause = this.MailMergeWhereClause(whereClause, f => personList.Contains(f.UserId));
}
}
mailMergeItems = this.ObjectContext.vwMailMerges.Where(whereClause).ToList();
private Expression<Func<vwMailMerge, bool>> MailMergeWhereClause(params Expression<Func<vwMailMerge, bool>>[] wheres)
{
if (wheres.Length == 0)
{
return x => true;
}
Expression result;
if (wheres[0] == null)
{
result = wheres[1].Body;
return Expression.Lambda<Func<vwMailMerge, bool>>(result, wheres[1].Parameters);
}
else
{
result = wheres[0].Body;
for (int i = 1; i < wheres.Length; i++)
{
result = Expression.And(result, wheres[i].Body);
}
return Expression.Lambda<Func<vwMailMerge, bool>>(result, wheres[0].Parameters);
}
}
}
当它到达“mailMergeItems =”时,它会掉线并给出错误:“参数'f'未绑定在指定的LINQ to Entities查询表达式中。”
我注意到,当仅检查人员或仅检查 membertypeId 时,它可以正常工作..但结合第二个错误,我认为它是“f =>”。