Question

我在dataview rowfilter中遇到小问题。如何在dataview rowfilter.i中处理文本框空值我在此过滤器中使用OR运算符。请帮助指导我这个问题。到目前为止我使用下面的代码。

Column1 = string.IsNullOrEmpty(txtColumn1.Text) ? "" : "%" + txtColumn1.Text + "%";
Column2 = string.IsNullOrEmpty(txtColumn2.Text) ? "" : "%" + txtColumn2.Text + "%";
Column3 = string.IsNullOrEmpty(txtColumn3.Text) ? "" : "%" + txtColumn3.Text + "%";

dataView.RowFilter = @"Column1 like '" + Column1 + "'" + "OR Column2 like '" + Column2 + "'" + "OR Column3 like '" + Column3 + "'";

Answer 1

以下代码段将帮助您使用空值控制过滤。如果有用的话，请尝试并标记答案

StringBuilder filter = new StringBuilder();
if (!(string.IsNullOrEmpty(textBox1.Text)))
    filter.Append("Column1 Like '%" + textBox1.Text + "%'");

if (!(string.IsNullOrEmpty(textBox2.Text)))
{
   if (filter.Length > 0) filter.Append(" OR ");
   filter.Append("Column2 Like '%" + textBox2.Text + "%'");
}

if (!(string.IsNullOrEmpty(textBox3.Text)))
{
   if (filter.Length > 0) filter.Append(" OR ");
   filter.Append("Column3 Like '%" + textBox3.Text + "%'");
}

DataView dv = dt.DefaultView;
dv.RowFilter = filter.ToString();

DataView RowFillter就像运算符一样

1 个答案: