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private void Form1_Load(object sender, EventArgs e)
{
webBrowser1.DocumentText = @"
<select id=""se"" style=""width: 119px"">
<option value=""1"">一</option>
<option value=""2"">二</option>
<option value=""3"">三</option>
<option value=""4"">四</option>
</select>";
}
private void button1_Click(object sender, EventArgs e)
{
webBrowser1.Navigate("javascript:document.getElementById('se').value = '4'; void(0);");
}
<select id="se" style="width: 119px">
<option value="1">一</option>
<option value="2">二</option>
<option value="3">三</option>
<option value="4">四</option>
</select>