针对你的问题“cannot convert null to 'int' because it is a non-nullable value type”,我可以提供以下分点回答: 理解错误信息: 这个错误信息表明你尝试将一个空值(null)赋给一个不可为空的整型(int)变量。在C#等语言中,int是一个值类型,它不能为null。如果尝试将null赋给int类型的变量,编译器会抛出错...
System.ArgumentException: Object of type 'System.DBNull' cannot be converted to type 'System.Decimal'. at System.ComponentModel.ReflectPropertyDescriptor.SetValue(Object component, Object value) at System.Windows.Forms.DataGridView.DataGridViewDataConnection.PushValue(Int32 boundColumnIndex, Int32 columnInd...
Cannot convert from 'Object to Int' Cannot convert int[] to object[] Cannot convert lambda expression to type 'System.Threading.Tasks.Task' Cannot convert null to 'int' because it is a value type--need help Cannot convert string[] to string in foreach loop Cannot convert type 'Syste...
publicintKey {get;set; } publicdecimalAmount {get;set; } } The amount like this. Which will prevent it to be null and this way when you delete the value in the column it will not throw an exception and the value shown in the grid will...
To reproduce the first problem, edit the first cell, clear the value, and the property will throw a "Please enter category name." exception but the exception in RadGridView1_DataError is Object of type 'System.DBNull' cannot be converted to type 'System.S...
Operator '!=' cannot be applied to 'int', 'null' 运算符“!=”不能应用于“int”,“null” lqw.eq(bo.getClassId() !=null, StudentClass::getClassId, bo.getClassId()); 把实体类中int型数据改成Long型 privateLong classId;
ORA-01407: cannot update ("ADMIN_BF"."CUSTOMER"."BALANCE") to NULL ORA-06512: at "ADMIN_BF.BALANCE_FEE", line 24 ORA-04088: error during execution of trigger 'ADMIN_BF.BALANCE_FEE' 当运行这些insert语句时,我得到了错误 INSERT INTO CHARTERS (CHARTER_ID,BOAT_ID,EXP_RETURN_DATE,ACL_RETUR...
a null pointer constant is converted to a pointer type, the resulting pointer, called a null pointer, is guaranteed to compare unequal to a pointer to any object or function. char *p=0;此时p就是一个空指针,不指向任何实际对象。 因此,如果 p 是一个指针变量,则 p = 0;、p = 0L;、p =...
Optional int parameter 'id' is present but cannot be translated into a null value due to being 错误 这个错误是因为java获取页面数据的时候,id值可能为空,而int的默认值为0,若想能够接受NULL的值,将int换成integer即可解决。 遇到这个错误就是把参数int 改成Integer...
private object GetValueByProperty(string key, string value, ref Type typeValue) { Type ...