//给窗体设置默认输入法
//新建一个窗体类ImeForm,设置Form1:ImeForm
public class ImeForm:System.Windows.Forms.Form 
 {
 [DllImport("imm32.dll")]
 public static extern IntPtr ImmGetContext(IntPtr hWnd);
 [DllImport("imm32.dll")]
 public static extern bool ImmGetConversionStatus(IntPtr hIMC,ref int conversion, ref int sentence);
 [DllImport("imm32.dll")]
 public static extern bool ImmSetConversionStatus(IntPtr hIMC, int conversion, int sentence);
//重载Form的OnActivated
 protected override void OnActivated(EventArgs e)
 {
 foreach (InputLanguage iL in InputLanguage.InstalledInputLanguages)
 {
 if (iL.LayoutName.Contains("搜狗拼音输入法"))
 {
 InputLanguage.CurrentInputLanguage = iL;
 break;
 }
 if (iL.LayoutName.Contains("智能 ABC"))
 {
 InputLanguage.CurrentInputLanguage = iL;
 break;
 }
 }
 IntPtr prt = ImmGetContext(this.Handle);
 int iMode = 1;
 int iSentence = 0;
 if (!ImmSetConversionStatus(prt, iMode, iSentence))
 {
 //MessageBox.Show("change error");
 }
 }
 }
还有设置半角输入法:
this.ImeMode = ImeMode.OnHalf; //写在Page_load中