Question

我有这个问题，我期待很多结果。

private void addContentInCmbPhy() {
            DbClassesDataContext myDb = new DbClassesDataContext(dbPath);
            var match = from phy in myDb.Physicians
                                        select phy.Phy_FName;

            for(IQueryable<string> phy in match){
                cmbPhysicians.Items.Add(phy);
            }
        }

在上面的查询中，它会返回几个结果，我希望这些名称结果作为项目插入到我的comboBox中，我该如何添加它？它给了我以下错误

 Error  7   Only assignment, call, increment, decrement, and new object expressions can be used as a statement  C:\Users\John\documents\visual studio 2010\Projects\PatientAdministration\PatientAdministration\Pat_Demog.cs    415 43  PatientAdministration

Error   8   ; expected  C:\Users\John\documents\visual studio 2010\Projects\PatientAdministration\PatientAdministration\Pat_Demog.cs    415 40  PatientAdministration
Error   9   ; expected  C:\Users\John\documents\visual studio 2010\Projects\PatientAdministration\PatientAdministration\Pat_Demog.cs    415 43  PatientAdministration

Answer 1

你是不是使用了错误的循环语句？它应该是foreach而不是for。如果你使用for循环，那么你需要一个增量器。

Answer 2

如果你在datacontext陈述中有using，那就是上帝了。因为只要你需要，你就可以得到连接。你之后直接处理它。我可能会这样做：

private void addContentInCmbPhy() 
{
    List<string> match;
    using (var  myDb = new DbClassesDataContext(dbPath))
    {
        match = (from phy in myDb.Physicians
                select phy.Phy_FName).ToList();
    }


    foreach(var phy in match){
        cmbPhysicians.Items.Add(phy);
    }
}

Answer 3

private void addContentInCmbPhy() 
{
    List<string> match;
    using (var  myDb = new DbClassesDataContext(dbPath))
{
   cmbPhysicians.Items.AddRange((from phy in myDb.Physicians
            select phy.Phy_FName).ToArray());
}

//  foreach(var phy in match){
//      cmbPhysicians.Items.Add(phy);
//  }
}

将每个单个查询结果作为内容插入到组合框中

3 个答案: