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分享System.ArgumentException: Item has already been added. Key in dictionary: 'Id' Key being added: 'Id'
public partial class Send : System.Web.UI.Page
{
private static DataTable addressDataTable;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
if (addressDataTable == null)
curentAddressTable();
else
addressDataTable.Clear();
……
private void curentAddressTable()
{
addressDataTable = new DataTable();
addressDataTable.Clear();
addressDataTable.Columns.Clear();
addressDataTable.Columns.Add("Id");//System.ArgumentException: Item has already been added. Key in dictionary: 'Id' Key being added: 'Id'
addressDataTable.Columns.Add("手机");
addressDataTable.Columns.Add("姓名");
}
{
private static DataTable addressDataTable;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
if (addressDataTable == null)
curentAddressTable();
else
addressDataTable.Clear();
……
private void curentAddressTable()
{
addressDataTable = new DataTable();
addressDataTable.Clear();
addressDataTable.Columns.Clear();
addressDataTable.Columns.Add("Id");//System.ArgumentException: Item has already been added. Key in dictionary: 'Id' Key being added: 'Id'
addressDataTable.Columns.Add("手机");
addressDataTable.Columns.Add("姓名");
}
...全文
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Pittypat 2007-07-09
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private static object __root = null;
private static object DataTableSyncRoot
{
get
{
if (__root == null)
System.Threading.Interlocked.CompareExchange(ref __root, new Object(), null);
return __root;
}
}
lock(DataTableSyncRoot)
{
addressDataTable = new DataTable();
... ...
}
private static object DataTableSyncRoot
{
get
{
if (__root == null)
System.Threading.Interlocked.CompareExchange(ref __root, new Object(), null);
return __root;
}
}
lock(DataTableSyncRoot)
{
addressDataTable = new DataTable();
... ...
}
Pittypat 2007-07-09
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addressDataTable是一个静态变量，你要知道，Web应用是多线程的，你没有处理多线程同步的问题，如果两个用户同时访问这个页面，可能就会产生这个问题。
yaya82 2007-07-08
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不要用Id作为column, table中有默认Id的column,换个名字吧
Fingter 2007-07-08
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xeppp 2007-07-08
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最好 把那个DataTable 放在属性里 楼上的意见也看一下
Server Error in '/' Application.Item has already been added. Key in dictionary: 'RegistryPermission'