c# - 如何创建消除重复代码的函数

Question

我的 Page_Load 函数中有以下代码:

string[] strArrayForEntity;
string[] strArrayForLocation;
string[] strArrayForSpecialty;
int inCounter;
inCounter = 0;

strArrayForEntity = new string[Entity.Items.Count];
foreach (ListItem li in Entity.Items)
{
    strArrayForEntity[inCounter] = li.Value;
    inCounter++;
}

inCounter = 0;
strArrayForLocation = new string[Location.Items.Count];
foreach (ListItem li in Location.Items)
{
    strArrayForLocation[inCounter] = li.Value;
    inCounter++;
}

inCounter = 0;
strArrayForSpecialty = new string[Specialty.Items.Count];
foreach (ListItem li in Specialty.Items)
{
    strArrayForSpecialty[inCounter] = li.Value;
    inCounter++;
}

如您所见，除了数组名称和下拉列表 ID 之外，我重复了同样的事情。

我想创建一个函数，我可以在其中提供数组名称和下拉列表，这样我就不必重复代码了。我尝试了以下方法:

public void AddTooArray(string[] strArrayName, DropDownList strID)
{
    inCounter = 0;
    foreach (ListItem li in strID.Items)
    {
        strArrayName = li.Value;
        inCounter++;
    }
}

我打算这样调用它:AddToArray(strArrayForEntity, Entity);

我在这一行中收到错误:strArrayName = li.value; 错误:无法将类型“string”隐式转换为“string[]”

我能解决这个问题吗？

测试代码:

protected void Page_Load(object sender, EventArgs e)
{
    strArrayForEntity = new string[Entity.Items.Count]; //count is 1 (2 entries in the dropdownlist)
    AddToArray(strArrayForEntity, Entity);
    MessageBox.Show(strArrayForEntity.Length.toString()); //displays 0
}
public void AddToArray(string[] strArrayName, DropDownList strID)
{
    inCounter = 0;
    foreach (ListItem li in strID.Items)
    {
        strArrayName[inCounter] = li.Value;
        inCounter++;
    }
}

Answer 1

您忘记了数组索引器。

strArrayName[inCounter] = li.Value;