考虑:
namespace WindowsApplication1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { //int[] val = { 0, 0}; int val; if (textBox1.Text == "") { MessageBox.Show("Input any no"); } else { val = Convert.ToInt32(textBox1.Text); Thread ot1 = new Thread(new ParameterizedThreadStart(SumData)); ot1.Start(val); } } private static void ReadData(object state) { System.Windows.Forms.Application.Run(); } void setTextboxText(int result) { if (this.InvokeRequired) { this.Invoke(new IntDelegate(SetTextboxTextSafe), new object[] { result }); } else { SetTextboxTextSafe(result); } } void SetTextboxTextSafe(int result) { label1.Text = result.ToString(); } private static void SumData(object state) { int result; //int[] icount = (int[])state; int icount = (int)state; for (int i = icount; i > 0; i--) { result += i; System.Threading.Thread.Sleep(1000); } setTextboxText(result); } delegate void IntDelegate(int result); private void button2_Click(object sender, EventArgs e) { Application.Exit(); } } }
为什么会发生此错误?
非静态字段,方法或属性’WindowsApplication1.Form1.setTextboxText(int)需要对象引用
看起来您正在setTextboxText从静态方法(特别是SumData)调用非静态成员(特别是属性或方法)。您将需要:
setTextboxText
SumData
也将被叫成员设为静态:
static void setTextboxText(int result)
{ // Write static logic for setTextboxText. // This may require a static singleton instance of Form1. }
Form1在调用方法中创建一个实例:
Form1
private static void SumData(object state)
{ int result = 0; //int[] icount = (int[])state; int icount = (int)state;
for (int i = icount; i > 0; i--) { result += i; System.Threading.Thread.Sleep(1000); } Form1 frm1 = new Form1(); frm1.setTextboxText(result);
}
Form1也可以选择传入的实例。
private void SumData(object state)
for (int i = icount; i > 0; i--) { result += i; System.Threading.Thread.Sleep(1000); } setTextboxText(result);
可以在MSDN上找到有关此错误的更多信息。