DataView RowFillter之类的运算子 [英] DataView RowFillter like operator

问题描述

我在dataview rowfilter中遇到小问题.如何在dataview rowfilter.i中处理文本框为空的值，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.

i am facing small issue in dataview rowfilter. How to handle textbox empty value in dataview rowfilter.i am using OR operator in this filter. Please help Guide me in this issue.so far i using below code.

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 + "'";

推荐答案

以下代码段将帮助您控制空值过滤.尝试尝试并标记答案(如果有用)

The below code snippet will help you to control filtering with empty values. Plase try and mark the answer if it useful

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();

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