我需要将rowstate属性设置为在运行时删除,需要将rowstate修改为Deleted。
据我所知,row.Delete()方法调用将行状态更改为Deleted,但它也删除了Row。
在这里,我只想将rowstate更改为Deleted,但不应删除datarow:
样例代码:
Delete delete = new Delete()
.from("tb_lib_report_package_link")
.where()
.add().criteria("lib_report_id = :pLibReportId ")
.and().criteria("package_Id IN (" + packageLink + ")")
.endWhere();
drow.AcceptChanges();
drow.Delete();
DataRow[] dra = new DataRow[] { drow };
DbAccessManager accessManager = DbAccessFactory.GetDatabaseAccess(DatabaseType.Oracle, "Data Source=SRV",
"DEV", "dev", this.AppCookieData["UserId"]);
accessManager.ClientId = this.AppCookieData["UserId"];
DbConnection cn = accessManager.CreateConnection();
delete.ParameterSetter = new ParameterSetter((builder, param, index) =>
{
switch (builder.GetColumnName(param))
{
case "pLibReportId":
param.DbType = this.ServerCfgReader.DefaultDBProvider.DBDataAccess.GetDbType(drow["LIB_REPORT_ID"].GetType());
param.Value = drow["LIB_REPORT_ID"];
break;
default:
throw new NotImplementedException();
}
});
accessManager.Delete(delete, dra, cn);
在这种情况下,我遇到了一个例外,即“无法通过行访问已删除的行信息”。
最佳答案
从MSDN开始:
在行上使用Delete方法后,RowState变为Deleted
现有的DataRow。在您调用AcceptChanges之前,它将保持已删除状态。在
这次,将DataRow从表中删除。
因此,只需调用Delete
,直到AcceptChanges
rowstate将为Deleted
,但行本身不会从数据表中删除。注意:如果要删除状态为Added
的数据行-调用Delete
后,它将立即从数据表中删除
更新资料
您可以像这样访问已删除的行数据:
var dt = new DataTable();
dt.Columns.Add("ID", typeof (long));
dt.Columns.Add("Name", typeof (string));
dt.Rows.Add(1, "xxx");
dt.Rows.Add(2, "yyy");
dt.AcceptChanges(); // now both rows are in 'Unchanged' state
dt.Rows[1].Delete(); // second row now in 'Deleted' state
foreach (DataRow dro in dt.Rows)
{
if (dro.RowState == DataRowState.Deleted)
// accessing deleted row
Console.WriteLine("Deleted row: ID={0}, Name={1}", dro["ID", DataRowVersion.Original], dro["Name", DataRowVersion.Original]);
else
// accessing row as usual
Console.WriteLine("Row: ID={0}, Name={1}", dro["ID"], dro["Name"]);
}
//putting into another array changes nothing in the manner of acessing deleted row
DataRow[] dra = new DataRow[] {dt.Rows[1]};
Console.WriteLine("Deleted row from another array: ID={0}", dra[0]["ID", DataRowVersion.Original]);
关于c# - 如何在运行时将rowstate属性设置为Deleted?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/26631602/