C# 按组合框导入ForeignKey值
我试图使用C# 按组合框导入ForeignKey值,c#,winforms,combobox,C#,Winforms,Combobox,我试图使用ComboBox导入ForeignKey值,但是ComboBox加载字符串值,ForeignKey类型为int,我试图将转换为字符串(),然后出现错误: “赋值的左侧必须是变量属性或索引器” 如有任何帮助,我们将不胜感激。此行错误: newInvoice.SupplierId.ToString() = comboBox1.Text; 您正在尝试为方法调用赋值 相反,这一行应该是: newInvoice.SupplierId = Int32.Parse(comboBox1.Text);
ComboBox
导入ForeignKey
值,但是ComboBox
加载字符串
值,ForeignKey
类型为int
,我试图将转换为字符串()
,然后出现错误:
“赋值的左侧必须是变量属性或索引器”
如有任何帮助,我们将不胜感激。此行错误:
newInvoice.SupplierId.ToString() = comboBox1.Text;
您正在尝试为方法调用赋值
相反,这一行应该是:
newInvoice.SupplierId = Int32.Parse(comboBox1.Text);
或更安全的方式:
int id = 0;
if (Int32.TryParse(comboBox1.Text, out id))
{
//we get valid integer from combobox
newInvoice.SupplierId = id;
dc.t_trackings.InsertOnSubmit(newInvoice);
dc.SubmitChanges();
}
else
{
//wrong value handling code goes here
}
int id = 0;
if (Int32.TryParse(comboBox1.Text, out id))
{
//we get valid integer from combobox
newInvoice.SupplierId = id;
dc.t_trackings.InsertOnSubmit(newInvoice);
dc.SubmitChanges();
}
else
{
//wrong value handling code goes here
}