public class book : System.Web.UI.Page
{
private string sql;
public string csql
{
set
{
sql = value;
}
}
private DataTable obj;
public DataTable cobj
{
get
{
return obj;
}
}
public void datatree(string ParentID, string lin)
{
string sqltxt = "select id,name,cname='" + lin + "'+name,fid FROM " + sql + " WHERE fid=" + ParentID + " order by showPage asc";
DataSet dt = new _DB().GetSqlDataSet(sqltxt);
if (lin == "")
{
obj = dt.Tables[0].Clone();
}
if (dt.Tables[0].Rows.Count > 0)
{ lin += "__";
for (int i = 0; i < dt.Tables[0].Rows.Count; i++)
{
obj.ImportRow(dt.Tables[0].Rows[i]);
datatree(dt.Tables[0].Rows[i]["id"].ToString(), lin);
}
}
else
{
return;
}
}}
在后台一调用就出错,提示:当前上下文中不存在名称“obj”是什么回事?
if (dt.Tables[0].Rows.Count > 0)
{
if(obj==null)
obj = new DataTable();
lin += "__";
for (int i = 0; i < dt.Tables[0].Rows.Count; i++)
{
obj.ImportRow(dt.Tables[0].Rows[i]);
datatree(dt.Tables[0].Rows[i]["id"].ToString(), lin);
}
}
if (lin == "")
{
obj = dt.Tables[0].Clone();
}
条件时候
obj为null
在后台一调用就出错,提示:当前上下文中不存在名称“obj”
{
obj = dt.Tables[0].Clone();
}
else if(obj==null) obj = new DataTable();